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Nick Piggin c32ccd87bf [PATCH] inotify: lock avoidance with parent watch status in dentry ... Previous inotify work avoidance is good when inotify is completely unused, but it breaks down if even a single watch is in place anywhere in the system. Robin Holt notices that udev is one such culprit - it slows down a 512-thread application on a 512 CPU system from 6 seconds to 22 minutes. Solve this by adding a flag in the dentry that tells inotify whether or not its parent inode has a watch on it. Event queueing to parent will skip taking locks if this flag is cleared. Setting and clearing of this flag on all child dentries versus event delivery: this is no in terms of race cases, and that was shown to be equivalent to always performing the check. The essential behaviour is that activity occuring _after_ a watch has been added and _before_ it has been removed, will generate events. Signed-off-by: Nick Piggin <npiggin@suse.de> Cc: Robert Love <rml@novell.com> Cc: John McCutchan <ttb@tentacle.dhs.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>		19 years ago
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acpi	[PATCH] s/;;/;/g	19 years ago
asm-alpha	[PATCH] remove ISA legacy functions: remove the helpers	19 years ago
asm-arm	[PATCH] AT91RM9200 Ethernet driver	19 years ago
asm-arm26	…
asm-cris	[PATCH] kill include/linux/platform.h, default_idle() cleanup	19 years ago
asm-frv	…
asm-generic	…
asm-h8300	…
asm-i386	[PATCH] kill include/linux/platform.h, default_idle() cleanup	19 years ago
asm-ia64	[PATCH] abstract type/size specification for assembly	19 years ago
asm-m32r	…
asm-m68k	…
asm-m68knommu	…
asm-mips	[PATCH] abstract type/size specification for assembly	19 years ago
asm-parisc	[PATCH] remove ISA legacy functions: remove the helpers	19 years ago
asm-powerpc	…
asm-ppc	…
asm-s390	[PATCH] s390: BUG() warnings	19 years ago
asm-sh	[PATCH] remove ISA legacy functions: remove the helpers	19 years ago
asm-sh64	…
asm-sparc	…
asm-sparc64	…
asm-um	…
asm-v850	[PATCH] abstract type/size specification for assembly	19 years ago
asm-x86_64	[PATCH] remove ISA legacy functions: remove the helpers	19 years ago
asm-xtensa	…
keys	…
linux	[PATCH] inotify: lock avoidance with parent watch status in dentry	19 years ago
math-emu	…
media	…
mtd	…
net	…
pcmcia	…
rdma	…
rxrpc	…
scsi	[PATCH] Make libata not powerdown drivers on PM_EVENT_FREEZE.	19 years ago
sound	[PATCH] sound: remove PC98-specific OPL3_HW_OPL3_PC98	19 years ago
video	[PATCH] Remove MODULE_PARM	19 years ago