version 1.2, 1998/02/19 23:52:14 |
version 1.3, 1998/07/23 20:34:00 |
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#include <sys/lock.h> |
#include <sys/lock.h> |
#include <sys/pool.h> |
#include <sys/pool.h> |
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#include <vm/vm.h> |
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#include <vm/vm_kern.h> |
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#if defined(UVM) |
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#include <uvm/uvm.h> |
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#endif |
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/* |
/* |
* Pool resource management utility. |
* Pool resource management utility. |
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* |
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* Memory is allocated in pages which are split into pieces according |
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* to the pool item size. Each page is kept on a list headed by `pr_pagelist' |
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* in the pool structure and the individual pool items are on a linked list |
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* headed by `ph_itemlist' in each page header. The memory for building |
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* the page list is either taken from the allocated pages themselves (for |
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* small pool items) or taken from an internal pool of page headers (`phpool'). |
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* |
*/ |
*/ |
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/* List of all pools */ |
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static TAILQ_HEAD(,pool) pool_head = TAILQ_HEAD_INITIALIZER(pool_head); |
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/* Private pool for page header structures */ |
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static struct pool phpool; |
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/* # of seconds to retain page after last use */ |
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int pool_inactive_time = 10; |
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/* Next candidate for drainage (see pool_drain()) */ |
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static struct pool *drainpp = NULL; |
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struct pool_item_header { |
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/* Page headers */ |
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TAILQ_ENTRY(pool_item_header) |
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ph_pagelist; /* pool page list */ |
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TAILQ_HEAD(,pool_item) ph_itemlist; /* chunk list for this page */ |
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LIST_ENTRY(pool_item_header) |
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ph_hashlist; /* Off-page page headers */ |
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int ph_nmissing; /* # of chunks in use */ |
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caddr_t ph_page; /* this page's address */ |
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struct timeval ph_time; /* last referenced */ |
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}; |
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struct pool_item { |
struct pool_item { |
struct pool_item *pi_next; |
#ifdef DIAGNOSTIC |
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int pi_magic; |
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#define PI_MAGIC 0xdeadbeef |
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#endif |
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/* Other entries use only this list entry */ |
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TAILQ_ENTRY(pool_item) pi_list; |
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}; |
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#define PR_HASH_INDEX(pp,addr) \ |
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(((u_long)(addr) >> (pp)->pr_pageshift) & (PR_HASHTABSIZE - 1)) |
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static struct pool_item_header |
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*pr_find_pagehead __P((struct pool *, caddr_t)); |
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static void pr_rmpage __P((struct pool *, struct pool_item_header *)); |
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static int pool_prime_page __P((struct pool *, caddr_t)); |
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static void *pool_page_alloc __P((unsigned long, int, int)); |
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static void pool_page_free __P((void *, unsigned long, int)); |
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int pool_chk __P((struct pool *, char *)); |
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#ifdef POOL_DIAGNOSTIC |
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/* |
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* Pool log entry. An array of these is allocated in pool_create(). |
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*/ |
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struct pool_log { |
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const char *pl_file; |
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long pl_line; |
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int pl_action; |
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#define PRLOG_GET 1 |
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#define PRLOG_PUT 2 |
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void *pl_addr; |
}; |
}; |
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/* Number of entries in pool log buffers */ |
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int pool_logsize = 10; |
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static void pr_log __P((struct pool *, void *, int, const char *, long)); |
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static void pr_printlog __P((struct pool *)); |
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static __inline__ void |
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pr_log(pp, v, action, file, line) |
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struct pool *pp; |
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void *v; |
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int action; |
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const char *file; |
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long line; |
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{ |
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int n = pp->pr_curlogentry; |
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struct pool_log *pl; |
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if ((pp->pr_flags & PR_LOGGING) == 0) |
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return; |
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/* |
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* Fill in the current entry. Wrap around and overwrite |
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* the oldest entry if necessary. |
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*/ |
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pl = &pp->pr_log[n]; |
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pl->pl_file = file; |
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pl->pl_line = line; |
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pl->pl_action = action; |
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pl->pl_addr = v; |
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if (++n >= pp->pr_logsize) |
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n = 0; |
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pp->pr_curlogentry = n; |
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} |
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static void |
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pr_printlog(pp) |
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struct pool *pp; |
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{ |
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int i = pp->pr_logsize; |
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int n = pp->pr_curlogentry; |
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if ((pp->pr_flags & PR_LOGGING) == 0) |
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return; |
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pool_print(pp, "printlog"); |
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/* |
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* Print all entries in this pool's log. |
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*/ |
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while (i-- > 0) { |
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struct pool_log *pl = &pp->pr_log[n]; |
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if (pl->pl_action != 0) { |
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printf("log entry %d:\n", i); |
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printf("\taction = %s, addr = %p\n", |
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pl->pl_action == PRLOG_GET ? "get" : "put", |
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pl->pl_addr); |
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printf("\tfile: %s at line %lu\n", |
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pl->pl_file, pl->pl_line); |
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} |
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if (++n >= pp->pr_logsize) |
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n = 0; |
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} |
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} |
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#else |
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#define pr_log(pp, v, action, file, line) |
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#define pr_printlog(pp) |
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#endif |
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/* |
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* Return the pool page header based on page address. |
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*/ |
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static __inline__ struct pool_item_header * |
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pr_find_pagehead(pp, page) |
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struct pool *pp; |
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caddr_t page; |
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{ |
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struct pool_item_header *ph; |
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if ((pp->pr_flags & PR_PHINPAGE) != 0) |
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return ((struct pool_item_header *)(page + pp->pr_phoffset)); |
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for (ph = LIST_FIRST(&pp->pr_hashtab[PR_HASH_INDEX(pp, page)]); |
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ph != NULL; |
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ph = LIST_NEXT(ph, ph_hashlist)) { |
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if (ph->ph_page == page) |
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return (ph); |
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} |
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return (NULL); |
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} |
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/* |
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* Remove a page from the pool. |
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*/ |
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static __inline__ void |
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pr_rmpage(pp, ph) |
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struct pool *pp; |
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struct pool_item_header *ph; |
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{ |
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/* |
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* Unlink a page from the pool and release it. |
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*/ |
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TAILQ_REMOVE(&pp->pr_pagelist, ph, ph_pagelist); |
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(*pp->pr_free)(ph->ph_page, pp->pr_pagesz, pp->pr_mtype); |
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pp->pr_npages--; |
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pp->pr_npagefree++; |
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if ((pp->pr_flags & PR_PHINPAGE) == 0) { |
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LIST_REMOVE(ph, ph_hashlist); |
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pool_put(&phpool, ph); |
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} |
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if (pp->pr_curpage == ph) { |
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/* |
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* Find a new non-empty page header, if any. |
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* Start search from the page head, to increase the |
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* chance for "high water" pages to be freed. |
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*/ |
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for (ph = TAILQ_FIRST(&pp->pr_pagelist); ph != NULL; |
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ph = TAILQ_NEXT(ph, ph_pagelist)) |
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if (TAILQ_FIRST(&ph->ph_itemlist) != NULL) |
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break; |
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pp->pr_curpage = ph; |
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} |
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} |
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/* |
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* Allocate and initialize a pool. |
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*/ |
struct pool * |
struct pool * |
pool_create(size, nitems, wchan, mtype, storage) |
pool_create(size, align, ioff, nitems, wchan, pagesz, alloc, release, mtype) |
size_t size; |
size_t size; |
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u_int align; |
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u_int ioff; |
int nitems; |
int nitems; |
char *wchan; |
char *wchan; |
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size_t pagesz; |
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void *(*alloc) __P((unsigned long, int, int)); |
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void (*release) __P((void *, unsigned long, int)); |
int mtype; |
int mtype; |
caddr_t storage; |
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{ |
{ |
struct pool *pp; |
struct pool *pp; |
caddr_t cp; |
int flags; |
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if (size < sizeof(struct pool_item)) { |
pp = (struct pool *)malloc(sizeof(*pp), M_POOL, M_NOWAIT); |
printf("pool_create: size %lu too small\n", (u_long)size); |
if (pp == NULL) |
return (NULL); |
return (NULL); |
} |
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if (storage) { |
flags = PR_FREEHEADER; |
pp = (struct pool *)storage; |
#ifdef POOL_DIAGNOSTIC |
cp = (caddr_t)ALIGN(pp + 1); |
if (pool_logsize != 0) |
} else { |
flags |= PR_LOGGING; |
pp = (struct pool *)malloc(sizeof(*pp), mtype, M_NOWAIT); |
#endif |
if (pp == NULL) |
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return (NULL); |
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cp = NULL; |
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} |
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pp->pr_freelist = NULL; |
pool_init(pp, size, align, ioff, flags, wchan, pagesz, |
pp->pr_freecount = 0; |
alloc, release, mtype); |
pp->pr_hiwat = 0; |
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pp->pr_flags = (storage ? PR_STATIC : 0); |
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pp->pr_size = size; |
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pp->pr_wchan = wchan; |
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pp->pr_mtype = mtype; |
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simple_lock_init(&pp->pr_lock); |
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if (nitems != 0) { |
if (nitems != 0) { |
if (pool_prime(pp, nitems, cp) != 0) { |
if (pool_prime(pp, nitems, NULL) != 0) { |
pool_destroy(pp); |
pool_destroy(pp); |
return (NULL); |
return (NULL); |
} |
} |
Line 100 pool_create(size, nitems, wchan, mtype, |
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Line 295 pool_create(size, nitems, wchan, mtype, |
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} |
} |
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/* |
/* |
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* Initialize the given pool resource structure. |
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* |
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* We export this routine to allow other kernel parts to declare |
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* static pools that must be initialized before malloc() is available. |
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*/ |
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void |
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pool_init(pp, size, align, ioff, flags, wchan, pagesz, alloc, release, mtype) |
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struct pool *pp; |
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size_t size; |
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u_int align; |
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u_int ioff; |
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int flags; |
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char *wchan; |
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size_t pagesz; |
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void *(*alloc) __P((unsigned long, int, int)); |
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void (*release) __P((void *, unsigned long, int)); |
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int mtype; |
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{ |
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int off, slack; |
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/* |
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* Check arguments and construct default values. |
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*/ |
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if (!powerof2(pagesz) || pagesz > PAGE_SIZE) |
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panic("pool_init: page size invalid (%lx)\n", (u_long)pagesz); |
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if (alloc == NULL) |
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alloc = pool_page_alloc; |
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if (release == NULL) |
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release = pool_page_free; |
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if (pagesz == 0) |
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pagesz = PAGE_SIZE; |
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if (align == 0) |
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align = ALIGN(1); |
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/* |
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* Initialize the pool structure. |
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*/ |
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TAILQ_INSERT_TAIL(&pool_head, pp, pr_poollist); |
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TAILQ_INIT(&pp->pr_pagelist); |
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pp->pr_curpage = NULL; |
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pp->pr_npages = 0; |
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pp->pr_minitems = 0; |
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pp->pr_minpages = 0; |
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pp->pr_maxpages = UINT_MAX; |
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pp->pr_flags = flags; |
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pp->pr_size = ALIGN(size); |
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pp->pr_align = align; |
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pp->pr_wchan = wchan; |
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pp->pr_mtype = mtype; |
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pp->pr_alloc = alloc; |
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pp->pr_free = release; |
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pp->pr_pagesz = pagesz; |
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pp->pr_pagemask = ~(pagesz - 1); |
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pp->pr_pageshift = ffs(pagesz) - 1; |
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/* |
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* Decide whether to put the page header off page to avoid |
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* wasting too large a part of the page. Off-page page headers |
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* go on a hash table, so we can match a returned item |
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* with its header based on the page address. |
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* We use 1/16 of the page size as the threshold (XXX: tune) |
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*/ |
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if (pp->pr_size < pagesz/16) { |
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/* Use the end of the page for the page header */ |
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pp->pr_flags |= PR_PHINPAGE; |
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pp->pr_phoffset = off = |
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pagesz - ALIGN(sizeof(struct pool_item_header)); |
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} else { |
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/* The page header will be taken from our page header pool */ |
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pp->pr_phoffset = 0; |
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off = pagesz; |
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bzero(pp->pr_hashtab, sizeof(pp->pr_hashtab)); |
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} |
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|
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/* |
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* Alignment is to take place at `ioff' within the item. This means |
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* we must reserve up to `align - 1' bytes on the page to allow |
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* appropriate positioning of each item. |
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* |
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* Silently enforce `0 <= ioff < align'. |
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*/ |
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pp->pr_itemoffset = ioff = ioff % align; |
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pp->pr_itemsperpage = (off - ((align - ioff) % align)) / pp->pr_size; |
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|
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/* |
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* Use the slack between the chunks and the page header |
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* for "cache coloring". |
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*/ |
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slack = off - pp->pr_itemsperpage * pp->pr_size; |
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pp->pr_maxcolor = (slack / align) * align; |
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pp->pr_curcolor = 0; |
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|
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pp->pr_nget = 0; |
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pp->pr_nfail = 0; |
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pp->pr_nput = 0; |
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pp->pr_npagealloc = 0; |
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pp->pr_npagefree = 0; |
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pp->pr_hiwat = 0; |
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|
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#ifdef POOL_DIAGNOSTIC |
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if ((flags & PR_LOGGING) != 0) { |
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pp->pr_log = malloc(pool_logsize * sizeof(struct pool_log), |
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M_TEMP, M_NOWAIT); |
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if (pp->pr_log == NULL) |
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pp->pr_flags &= ~PR_LOGGING; |
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pp->pr_curlogentry = 0; |
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pp->pr_logsize = pool_logsize; |
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} |
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#endif |
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|
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simple_lock_init(&pp->pr_lock); |
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|
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/* |
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* Initialize private page header pool if we haven't done so yet. |
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*/ |
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if (phpool.pr_size == 0) { |
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pool_init(&phpool, sizeof(struct pool_item_header), 0, 0, |
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0, "phpool", 0, 0, 0, 0); |
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} |
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return; |
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} |
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|
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/* |
* De-commision a pool resource. |
* De-commision a pool resource. |
*/ |
*/ |
void |
void |
pool_destroy(pp) |
pool_destroy(pp) |
struct pool *pp; |
struct pool *pp; |
{ |
{ |
struct pool_item *pi; |
struct pool_item_header *ph; |
|
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if (pp->pr_flags & PR_STATIC) |
#ifdef DIAGNOSTIC |
return; |
if (pp->pr_nget - pp->pr_nput != 0) { |
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pr_printlog(pp); |
while ((pi = pp->pr_freelist) != NULL) { |
panic("pool_destroy: pool busy: still out: %lu\n", |
pp->pr_freelist = pi->pi_next; |
pp->pr_nget - pp->pr_nput); |
free(pi, pp->pr_mtype); |
|
} |
} |
free(pp, pp->pr_mtype); |
#endif |
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|
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/* Remove all pages */ |
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if ((pp->pr_flags & PR_STATIC) == 0) |
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while ((ph = pp->pr_pagelist.tqh_first) != NULL) |
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pr_rmpage(pp, ph); |
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|
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/* Remove from global pool list */ |
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TAILQ_REMOVE(&pool_head, pp, pr_poollist); |
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drainpp = NULL; |
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|
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#ifdef POOL_DIAGNOSTIC |
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if ((pp->pr_flags & PR_LOGGING) != 0) |
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free(pp->pr_log, M_TEMP); |
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#endif |
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|
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if (pp->pr_flags & PR_FREEHEADER) |
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free(pp, M_POOL); |
} |
} |
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|
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/* |
/* |
* Grab an item from the pool; must be called at splbio |
* Grab an item from the pool; must be called at appropriate spl level |
*/ |
*/ |
|
#ifdef POOL_DIAGNOSTIC |
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void * |
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_pool_get(pp, flags, file, line) |
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struct pool *pp; |
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int flags; |
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const char *file; |
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long line; |
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#else |
void * |
void * |
pool_get(pp, flags) |
pool_get(pp, flags) |
struct pool *pp; |
struct pool *pp; |
int flags; |
int flags; |
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#endif |
{ |
{ |
void *v; |
void *v; |
struct pool_item *pi; |
struct pool_item *pi; |
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struct pool_item_header *ph; |
|
|
#ifdef DIAGNOSTIC |
#ifdef DIAGNOSTIC |
if ((pp->pr_flags & PR_STATIC) && (flags & PR_MALLOCOK)) |
if ((pp->pr_flags & PR_STATIC) && (flags & PR_MALLOCOK)) { |
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pr_printlog(pp); |
panic("pool_get: static"); |
panic("pool_get: static"); |
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} |
#endif |
#endif |
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|
again: |
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simple_lock(&pp->pr_lock); |
simple_lock(&pp->pr_lock); |
if ((v = pp->pr_freelist) == NULL) { |
if (curproc == NULL && (flags & PR_WAITOK) != 0) |
if (flags & PR_MALLOCOK) |
panic("pool_get: must have NOWAIT"); |
v = (void *)malloc(pp->pr_size, pp->pr_mtype, M_NOWAIT); |
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|
|
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/* |
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* The convention we use is that if `curpage' is not NULL, then |
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* it points at a non-empty bucket. In particular, `curpage' |
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* never points at a page header which has PR_PHINPAGE set and |
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* has no items in its bucket. |
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*/ |
|
again: |
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if ((ph = pp->pr_curpage) == NULL) { |
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void *v = (*pp->pr_alloc)(pp->pr_pagesz, flags, pp->pr_mtype); |
if (v == NULL) { |
if (v == NULL) { |
if ((flags & PR_WAITOK) == 0) |
if (flags & PR_URGENT) |
|
panic("pool_get: urgent"); |
|
if ((flags & PR_WAITOK) == 0) { |
|
pp->pr_nfail++; |
|
simple_unlock(&pp->pr_lock); |
return (NULL); |
return (NULL); |
|
} |
|
|
pp->pr_flags |= PR_WANTED; |
pp->pr_flags |= PR_WANTED; |
simple_unlock(&pp->pr_lock); |
simple_unlock(&pp->pr_lock); |
tsleep((caddr_t)pp, PSWP, pp->pr_wchan, 0); |
tsleep((caddr_t)pp, PSWP, pp->pr_wchan, 0); |
goto again; |
simple_lock(&pp->pr_lock); |
|
} else { |
|
pp->pr_npagealloc++; |
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pool_prime_page(pp, v); |
} |
} |
} else { |
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pi = v; |
goto again; |
pp->pr_freelist = pi->pi_next; |
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pp->pr_freecount--; |
|
} |
} |
|
|
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if ((v = pi = TAILQ_FIRST(&ph->ph_itemlist)) == NULL) |
|
panic("pool_get: %s: page empty", pp->pr_wchan); |
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|
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pr_log(pp, v, PRLOG_GET, file, line); |
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|
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#ifdef DIAGNOSTIC |
|
if (pi->pi_magic != PI_MAGIC) { |
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pr_printlog(pp); |
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panic("pool_get(%s): free list modified: magic=%x; page %p;" |
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" item addr %p\n", |
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pp->pr_wchan, pi->pi_magic, ph->ph_page, pi); |
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} |
|
#endif |
|
|
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/* |
|
* Remove from item list. |
|
*/ |
|
TAILQ_REMOVE(&ph->ph_itemlist, pi, pi_list); |
|
ph->ph_nmissing++; |
|
if (TAILQ_FIRST(&ph->ph_itemlist) == NULL) { |
|
/* |
|
* Find a new non-empty page header, if any. |
|
* Start search from the page head, to increase |
|
* the chance for "high water" pages to be freed. |
|
* |
|
* First, move the now empty page to the head of |
|
* the page list. |
|
*/ |
|
TAILQ_REMOVE(&pp->pr_pagelist, ph, ph_pagelist); |
|
TAILQ_INSERT_HEAD(&pp->pr_pagelist, ph, ph_pagelist); |
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while ((ph = TAILQ_NEXT(ph, ph_pagelist)) != NULL) |
|
if (TAILQ_FIRST(&ph->ph_itemlist) != NULL) |
|
break; |
|
|
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pp->pr_curpage = ph; |
|
} |
|
|
|
pp->pr_nget++; |
simple_unlock(&pp->pr_lock); |
simple_unlock(&pp->pr_lock); |
return (v); |
return (v); |
} |
} |
|
|
/* |
/* |
* Return resource to the pool; must be called at splbio |
* Return resource to the pool; must be called at appropriate spl level |
*/ |
*/ |
|
#ifdef POOL_DIAGNOSTIC |
|
void |
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_pool_put(pp, v, file, line) |
|
struct pool *pp; |
|
void *v; |
|
const char *file; |
|
long line; |
|
#else |
void |
void |
pool_put(pp, v) |
pool_put(pp, v) |
struct pool *pp; |
struct pool *pp; |
void *v; |
void *v; |
|
#endif |
{ |
{ |
struct pool_item *pi = v; |
struct pool_item *pi = v; |
|
struct pool_item_header *ph; |
|
caddr_t page; |
|
|
|
page = (caddr_t)((u_long)v & pp->pr_pagemask); |
|
|
simple_lock(&pp->pr_lock); |
simple_lock(&pp->pr_lock); |
if ((pp->pr_flags & PR_WANTED) || pp->pr_freecount < pp->pr_hiwat) { |
|
/* Return to pool */ |
pr_log(pp, v, PRLOG_PUT, file, line); |
pi->pi_next = pp->pr_freelist; |
|
pp->pr_freelist = pi; |
if ((ph = pr_find_pagehead(pp, page)) == NULL) { |
pp->pr_freecount++; |
pr_printlog(pp); |
if (pp->pr_flags & PR_WANTED) { |
panic("pool_put: %s: page header missing", pp->pr_wchan); |
pp->pr_flags &= ~PR_WANTED; |
} |
wakeup((caddr_t)pp); |
|
} |
/* |
} else { |
* Return to item list. |
|
*/ |
#ifdef DIAGNOSTIC |
#ifdef DIAGNOSTIC |
if (pp->pr_flags & PR_STATIC) { |
pi->pi_magic = PI_MAGIC; |
/* can't happen because hiwat > freecount */ |
|
panic("pool_put: static"); |
|
} |
|
#endif |
#endif |
/* Return to system */ |
TAILQ_INSERT_HEAD(&ph->ph_itemlist, pi, pi_list); |
free(v, M_DEVBUF); |
ph->ph_nmissing--; |
|
pp->pr_nput++; |
|
|
|
/* Cancel "pool empty" condition if it exists */ |
|
if (pp->pr_curpage == NULL) |
|
pp->pr_curpage = ph; |
|
|
|
if (pp->pr_flags & PR_WANTED) { |
|
pp->pr_flags &= ~PR_WANTED; |
|
wakeup((caddr_t)pp); |
|
simple_unlock(&pp->pr_lock); |
|
return; |
|
} |
|
|
/* |
/* |
* Return any excess items allocated during periods of |
* If this page is now complete, move it to the end of the pagelist. |
* contention. |
* If this page has just become un-empty, move it the head. |
*/ |
*/ |
while (pp->pr_freecount > pp->pr_hiwat) { |
if (ph->ph_nmissing == 0) { |
pi = pp->pr_freelist; |
if (pp->pr_npages > pp->pr_maxpages) { |
pp->pr_freelist = pi->pi_next; |
#if 0 |
pp->pr_freecount--; |
timeout(pool_drain, 0, pool_inactive_time*hz); |
free(pi, M_DEVBUF); |
#else |
|
pr_rmpage(pp, ph); |
|
#endif |
|
} else { |
|
TAILQ_REMOVE(&pp->pr_pagelist, ph, ph_pagelist); |
|
TAILQ_INSERT_TAIL(&pp->pr_pagelist, ph, ph_pagelist); |
|
ph->ph_time = time; |
|
|
|
/* XXX - update curpage */ |
|
for (ph = TAILQ_FIRST(&pp->pr_pagelist); ph != NULL; |
|
ph = TAILQ_NEXT(ph, ph_pagelist)) |
|
if (TAILQ_FIRST(&ph->ph_itemlist) != NULL) |
|
break; |
|
|
|
pp->pr_curpage = ph; |
} |
} |
} |
} |
|
|
simple_unlock(&pp->pr_lock); |
simple_unlock(&pp->pr_lock); |
} |
} |
|
|
/* |
/* |
* Add N items to the pool |
* Add N items to the pool. |
*/ |
*/ |
int |
int |
pool_prime(pp, n, storage) |
pool_prime(pp, n, storage) |
Line 211 pool_prime(pp, n, storage) |
|
Line 653 pool_prime(pp, n, storage) |
|
int n; |
int n; |
caddr_t storage; |
caddr_t storage; |
{ |
{ |
struct pool_item *pi; |
caddr_t cp; |
caddr_t cp = storage; |
int newnitems, newpages; |
|
|
#ifdef DIAGNOSTIC |
#ifdef DIAGNOSTIC |
if (storage && !(pp->pr_flags & PR_STATIC)) |
if (storage && !(pp->pr_flags & PR_STATIC)) |
Line 220 pool_prime(pp, n, storage) |
|
Line 662 pool_prime(pp, n, storage) |
|
/* !storage && static caught below */ |
/* !storage && static caught below */ |
#endif |
#endif |
|
|
|
newnitems = pp->pr_minitems + n; |
|
newpages = |
|
roundup(pp->pr_itemsperpage,newnitems) / pp->pr_itemsperpage |
|
- pp->pr_minpages; |
|
|
simple_lock(&pp->pr_lock); |
simple_lock(&pp->pr_lock); |
pp->pr_hiwat += n; |
while (newpages-- > 0) { |
while (n--) { |
|
if (pp->pr_flags & PR_STATIC) { |
if (pp->pr_flags & PR_STATIC) { |
pi = (struct pool_item *)cp; |
cp = storage; |
cp = (caddr_t)ALIGN(cp + pp->pr_size); |
storage += pp->pr_pagesz; |
} else |
} else { |
pi = malloc(pp->pr_size, pp->pr_mtype, M_NOWAIT); |
cp = (*pp->pr_alloc)(pp->pr_pagesz, 0, pp->pr_mtype); |
|
} |
|
|
if (pi == NULL) { |
if (cp == NULL) { |
simple_unlock(&pp->pr_lock); |
simple_unlock(&pp->pr_lock); |
return (ENOMEM); |
return (ENOMEM); |
} |
} |
|
|
pi->pi_next = pp->pr_freelist; |
pool_prime_page(pp, cp); |
pp->pr_freelist = pi; |
pp->pr_minpages++; |
pp->pr_freecount++; |
|
} |
} |
|
|
|
pp->pr_minitems = newnitems; |
|
|
|
if (pp->pr_minpages >= pp->pr_maxpages) |
|
pp->pr_maxpages = pp->pr_minpages + 1; /* XXX */ |
|
|
simple_unlock(&pp->pr_lock); |
simple_unlock(&pp->pr_lock); |
return (0); |
return (0); |
} |
} |
|
|
|
/* |
|
* Add a page worth of items to the pool. |
|
*/ |
|
int |
|
pool_prime_page(pp, storage) |
|
struct pool *pp; |
|
caddr_t storage; |
|
{ |
|
struct pool_item *pi; |
|
struct pool_item_header *ph; |
|
caddr_t cp = storage; |
|
unsigned int align = pp->pr_align; |
|
unsigned int ioff = pp->pr_itemoffset; |
|
int n; |
|
|
|
if ((pp->pr_flags & PR_PHINPAGE) != 0) { |
|
ph = (struct pool_item_header *)(cp + pp->pr_phoffset); |
|
} else { |
|
ph = pool_get(&phpool, PR_URGENT); |
|
LIST_INSERT_HEAD(&pp->pr_hashtab[PR_HASH_INDEX(pp, cp)], |
|
ph, ph_hashlist); |
|
} |
|
|
|
/* |
|
* Insert page header. |
|
*/ |
|
TAILQ_INSERT_HEAD(&pp->pr_pagelist, ph, ph_pagelist); |
|
TAILQ_INIT(&ph->ph_itemlist); |
|
ph->ph_page = storage; |
|
ph->ph_nmissing = 0; |
|
ph->ph_time.tv_sec = ph->ph_time.tv_usec = 0; |
|
|
|
/* |
|
* Color this page. |
|
*/ |
|
cp = (caddr_t)(cp + pp->pr_curcolor); |
|
if ((pp->pr_curcolor += align) > pp->pr_maxcolor) |
|
pp->pr_curcolor = 0; |
|
|
|
/* |
|
* Adjust storage to apply aligment to `pr_itemoffset' in each item. |
|
*/ |
|
if (ioff != 0) |
|
cp = (caddr_t)(cp + (align - ioff)); |
|
|
|
/* |
|
* Insert remaining chunks on the bucket list. |
|
*/ |
|
n = pp->pr_itemsperpage; |
|
|
|
while (n--) { |
|
pi = (struct pool_item *)cp; |
|
|
|
/* Insert on page list */ |
|
TAILQ_INSERT_TAIL(&ph->ph_itemlist, pi, pi_list); |
|
#ifdef DIAGNOSTIC |
|
pi->pi_magic = PI_MAGIC; |
|
#endif |
|
cp = (caddr_t)(cp + pp->pr_size); |
|
} |
|
|
|
/* |
|
* If the pool was depleted, point at the new page. |
|
*/ |
|
if (pp->pr_curpage == NULL) |
|
pp->pr_curpage = ph; |
|
|
|
if (++pp->pr_npages > pp->pr_hiwat) |
|
pp->pr_hiwat = pp->pr_npages; |
|
|
|
return (0); |
|
} |
|
|
|
void |
|
pool_setlowat(pp, n) |
|
pool_handle_t pp; |
|
int n; |
|
{ |
|
pp->pr_minitems = n; |
|
if (n == 0) { |
|
pp->pr_minpages = 0; |
|
return; |
|
} |
|
pp->pr_minpages = |
|
roundup(pp->pr_itemsperpage,n) / pp->pr_itemsperpage; |
|
} |
|
|
|
void |
|
pool_sethiwat(pp, n) |
|
pool_handle_t pp; |
|
int n; |
|
{ |
|
if (n == 0) { |
|
pp->pr_maxpages = 0; |
|
return; |
|
} |
|
pp->pr_maxpages = |
|
roundup(pp->pr_itemsperpage,n) / pp->pr_itemsperpage; |
|
} |
|
|
|
|
|
/* |
|
* Default page allocator. |
|
*/ |
|
static void * |
|
pool_page_alloc(sz, flags, mtype) |
|
unsigned long sz; |
|
int flags; |
|
int mtype; |
|
{ |
|
vm_offset_t va; |
|
|
|
#if defined(UVM) |
|
va = uvm_km_kmemalloc(kernel_map, uvm.kernel_object, |
|
(vm_size_t)sz, UVM_KMF_NOWAIT); |
|
#else |
|
va = kmem_malloc(kmem_map, (vm_size_t)sz, 0); |
|
#endif |
|
return ((void *)va); |
|
} |
|
|
|
static void |
|
pool_page_free(v, sz, mtype) |
|
void *v; |
|
unsigned long sz; |
|
int mtype; |
|
{ |
|
|
|
#if defined(UVM) |
|
uvm_km_free(kernel_map, (vm_offset_t)v, sz); |
|
#else |
|
kmem_free(kmem_map, (vm_offset_t)v, sz); |
|
#endif |
|
} |
|
|
|
/* |
|
* Release all complete pages that have not been used recently. |
|
*/ |
|
void |
|
pool_reclaim (pp) |
|
pool_handle_t pp; |
|
{ |
|
struct pool_item_header *ph, *phnext; |
|
struct timeval curtime = time; |
|
|
|
if (pp->pr_flags & PR_STATIC) |
|
return; |
|
|
|
if (simple_lock_try(&pp->pr_lock) == 0) |
|
return; |
|
|
|
for (ph = TAILQ_FIRST(&pp->pr_pagelist); ph != NULL; ph = phnext) { |
|
phnext = TAILQ_NEXT(ph, ph_pagelist); |
|
|
|
/* Check our minimum page claim */ |
|
if (pp->pr_npages <= pp->pr_minpages) |
|
break; |
|
|
|
if (ph->ph_nmissing == 0) { |
|
struct timeval diff; |
|
timersub(&curtime, &ph->ph_time, &diff); |
|
if (diff.tv_sec < pool_inactive_time) |
|
continue; |
|
pr_rmpage(pp, ph); |
|
} |
|
} |
|
|
|
simple_unlock(&pp->pr_lock); |
|
} |
|
|
|
|
|
/* |
|
* Drain pools, one at a time. |
|
*/ |
|
void |
|
pool_drain(arg) |
|
void *arg; |
|
{ |
|
struct pool *pp; |
|
int s = splimp(); |
|
|
|
/* XXX:lock pool head */ |
|
if (drainpp == NULL && (drainpp = TAILQ_FIRST(&pool_head)) == NULL) { |
|
splx(s); |
|
return; |
|
} |
|
|
|
pp = drainpp; |
|
drainpp = TAILQ_NEXT(pp, pr_poollist); |
|
/* XXX:unlock pool head */ |
|
|
|
pool_reclaim(pp); |
|
splx(s); |
|
} |
|
|
|
|
|
#ifdef DEBUG |
|
/* |
|
* Diagnostic helpers. |
|
*/ |
|
void |
|
pool_print(pp, label) |
|
struct pool *pp; |
|
char *label; |
|
{ |
|
|
|
if (label != NULL) |
|
printf("%s: ", label); |
|
|
|
printf("pool %s: nalloc %lu nfree %lu npagealloc %lu npagefree %lu\n" |
|
" npages %u minitems %u itemsperpage %u itemoffset %u\n", |
|
pp->pr_wchan, |
|
pp->pr_nget, |
|
pp->pr_nput, |
|
pp->pr_npagealloc, |
|
pp->pr_npagefree, |
|
pp->pr_npages, |
|
pp->pr_minitems, |
|
pp->pr_itemsperpage, |
|
pp->pr_itemoffset); |
|
} |
|
|
|
int |
|
pool_chk(pp, label) |
|
struct pool *pp; |
|
char *label; |
|
{ |
|
struct pool_item_header *ph; |
|
int r = 0; |
|
|
|
simple_lock(&pp->pr_lock); |
|
|
|
for (ph = TAILQ_FIRST(&pp->pr_pagelist); ph != NULL; |
|
ph = TAILQ_NEXT(ph, ph_pagelist)) { |
|
|
|
struct pool_item *pi; |
|
int n; |
|
caddr_t page; |
|
|
|
page = (caddr_t)((u_long)ph & pp->pr_pagemask); |
|
if (page != ph->ph_page) { |
|
if (label != NULL) |
|
printf("%s: ", label); |
|
printf("pool(%s): page inconsistency: page %p;" |
|
" at page head addr %p (p %p)\n", |
|
pp->pr_wchan, ph->ph_page, |
|
ph, page); |
|
r++; |
|
goto out; |
|
} |
|
|
|
for (pi = TAILQ_FIRST(&ph->ph_itemlist), n = 0; |
|
pi != NULL; |
|
pi = TAILQ_NEXT(pi,pi_list), n++) { |
|
|
|
#ifdef DIAGNOSTIC |
|
if (pi->pi_magic != PI_MAGIC) { |
|
if (label != NULL) |
|
printf("%s: ", label); |
|
printf("pool(%s): free list modified: magic=%x;" |
|
" page %p; item ordinal %d;" |
|
" addr %p (p %p)\n", |
|
pp->pr_wchan, pi->pi_magic, ph->ph_page, |
|
n, pi, page); |
|
panic("pool"); |
|
} |
|
#endif |
|
page = (caddr_t)((u_long)pi & pp->pr_pagemask); |
|
if (page == ph->ph_page) |
|
continue; |
|
|
|
if (label != NULL) |
|
printf("%s: ", label); |
|
printf("pool(%s): page inconsistency: page %p;" |
|
" item ordinal %d; addr %p (p %p)\n", |
|
pp->pr_wchan, ph->ph_page, |
|
n, pi, page); |
|
r++; |
|
goto out; |
|
} |
|
} |
|
out: |
|
simple_unlock(&pp->pr_lock); |
|
return (r); |
|
} |
|
#endif |