CVS log for src/sys/kern/sys_pipe.c

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Default branch: MAIN
Current tag: pgoyette-compat-0930

Revision 1.146 / (download) - annotate - [select for diffs], Sun Jun 10 17:54:51 2018 UTC (5 years, 10 months ago) by jdolecek
Branch: MAIN
CVS Tags: phil-wifi-base, pgoyette-compat-20190127, pgoyette-compat-20190118, pgoyette-compat-1226, pgoyette-compat-1126, pgoyette-compat-1020, pgoyette-compat-0930, pgoyette-compat-0906, pgoyette-compat-0728, pgoyette-compat-0625, isaki-audio2-base, isaki-audio2
Branch point for: phil-wifi
Changes since 1.145: +76 -102 lines
Diff to previous 1.145 (colored)

convert the (still disabled) 'direct write' for pipes to use the
experimental PMAP_DIRECT if available; the direct code paths now survive
longer than the pmap_enter() variant, but still triggers panic during
build.sh tools run; remove some obsolete sysctls

add some XXXs to mark places which need attention to make this more stable

Note: the loan case is now actually significantly slower than the
non-loan case on MP systems, due to synchronous IPIs triggered by
marking the page read-only by uvm_loan(); this is being discussed
in the email thread
https://mail-index.netbsd.org/tech-kern/2018/05/21/msg023441.html

that is basically the same issue due to which loaning was disabled
for sosend()

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