CVS log for src/sys/dev/lockstat.h

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Default branch: MAIN

lockstat(4): Membar audit.

- Serialize updates to lockstat_enabled, lockstat_dev_enabled, and
  lockstat_dtrace_enabled with a new __cpu_simple_lock.

- Use xc_barrier to obviate any need for additional membars in
  lockstat_event.

- Use atomic_load/store_* for access that might not be serialized by
  lockstat_lock or lockstat_enabled_lock.

update from HEAD

Sync with HEAD

Fix non-cpu counter build.

Sync with HEAD

Introduce a new flag LB_DTRACE for dtrace lockstat events.
Split lockstat_enabled into two parts, one controlled by dtrace called
"lockstat_dtrace_enabled" and one by the lockstat device called
"lockstat_dev_enabled". Create a macro that needs to be called when either
of them changes LOCKSTAT_ENABLED_UPDATE().

fix compression shift

dtrace bits from riastradh

sync with head.

Sync with HEAD.

bump lockstat interface version for timespec.

Sync with HEAD.

sync with head.

sync with head.

Remove clause 3 and 4 from TNF licenses

Add MI code to support in-kernel preemption. Preemption is deferred by
one of the following:

- Holding kernel_lock (indicating that the code is not MT safe).
- Bracketing critical sections with kpreempt_disable/kpreempt_enable.
- Holding the interrupt priority level above IPL_NONE.

Statistics on kernel preemption are reported via event counters, and
where preemption is deferred for some reason, it's also reported via
lockstat. The LWP priority at which preemption is triggered is tuneable
via sysctl.

sync with HEAD

Sync with HEAD.

sync with head.

lockstat: no longer track lockmgr() events.

sync with head

sync with HEAD

Sync with HEAD

Start detangling lock.h from intr.h. This is likely to cause short term
breakage, but the mess of dependencies has been regularly breaking the
build recently anyhow.

sync with head.

Sync with head.

- Increase default number of trace buffers to 10000.
- New options:
     -f         Trace only by calling functions.
     -m         Merge call sites within unique functions.
     -M         Merge lock addresses within unique objects.

sync with head.

Merge newlock2 to head.

lockstat:

- Cache enabled/disabled status on entry.
- Don't read the cycle counter unless enabled.

Sync with head.

Remove more duplicate headers.
Patch by Slava Semushin <slava.semushin@gmail.com>

Again, this was tested by comparing obj files from a pristine and a patched
source tree against an i386/ALL kernel, and also for src/sbin/fsck_ffs,
src/sbin/fsdb and src/usr.sbin/makefs. Only changes in assert() line numbers
were detected in 'objdump -d' output.

Acquire proclist_mutex before sending signals.

Sync with head.

sync with head.

Checkpoint work in progress.

file lockstat.h was added on branch yamt-lazymbuf on 2006-12-30 20:47:50 +0000

lockstat: improve reporting slightly, and fix a bug where the command
could spin while resorting lists.

Checkpoint work in progress.

sync with head.

sync with head

file lockstat.h was added on branch yamt-pdpolicy on 2006-09-14 12:31:26 +0000

file lockstat.h was added on branch rpaulo-netinet-merge-pcb on 2006-09-09 02:49:09 +0000

Add the 'lockstat' driver, which collects basic information about lock events.