https://github.com/torvalds/linux
Revision 7b2b55da1db10a5525460633ae4b6fb0be060c41 authored by Jason Xing on 25 August 2019, 00:54:53 UTC, committed by Linus Torvalds on 25 August 2019, 02:48:42 UTC
Only when calling the poll syscall the first time can user receive POLLPRI correctly. After that, user always fails to acquire the event signal. Reproduce case: 1. Get the monitor code in Documentation/accounting/psi.txt 2. Run it, and wait for the event triggered. 3. Kill and restart the process. The question is why we can end up with poll_scheduled = 1 but the work not running (which would reset it to 0). And the answer is because the scheduling side sees group->poll_kworker under RCU protection and then schedules it, but here we cancel the work and destroy the worker. The cancel needs to pair with resetting the poll_scheduled flag. Link: http://lkml.kernel.org/r/1566357985-97781-1-git-send-email-joseph.qi@linux.alibaba.com Signed-off-by: Jason Xing <kerneljasonxing@linux.alibaba.com> Signed-off-by: Joseph Qi <joseph.qi@linux.alibaba.com> Reviewed-by: Caspar Zhang <caspar@linux.alibaba.com> Reviewed-by: Suren Baghdasaryan <surenb@google.com> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Tip revision: 7b2b55da1db10a5525460633ae4b6fb0be060c41 authored by Jason Xing on 25 August 2019, 00:54:53 UTC
psi: get poll_work to run when calling poll syscall next time
psi: get poll_work to run when calling poll syscall next time
Tip revision: 7b2b55d
File | Mode | Size |
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Kconfig | -rw-r--r-- | 3.3 KB |
Makefile | -rw-r--r-- | 459 bytes |
aops.c | -rw-r--r-- | 51.7 KB |
aops.h | -rw-r--r-- | 3.2 KB |
attrib.c | -rw-r--r-- | 88.8 KB |
attrib.h | -rw-r--r-- | 3.5 KB |
bitmap.c | -rw-r--r-- | 4.7 KB |
bitmap.h | -rw-r--r-- | 2.8 KB |
collate.c | -rw-r--r-- | 2.8 KB |
collate.h | -rw-r--r-- | 934 bytes |
compress.c | -rw-r--r-- | 28.0 KB |
debug.c | -rw-r--r-- | 4.0 KB |
debug.h | -rw-r--r-- | 1.5 KB |
dir.c | -rw-r--r-- | 50.8 KB |
dir.h | -rw-r--r-- | 908 bytes |
endian.h | -rw-r--r-- | 1.4 KB |
file.c | -rw-r--r-- | 59.9 KB |
index.c | -rw-r--r-- | 14.0 KB |
index.h | -rw-r--r-- | 4.7 KB |
inode.c | -rw-r--r-- | 95.6 KB |
inode.h | -rw-r--r-- | 10.3 KB |
layout.h | -rw-r--r-- | 96.2 KB |
lcnalloc.c | -rw-r--r-- | 31.6 KB |
lcnalloc.h | -rw-r--r-- | 4.9 KB |
logfile.c | -rw-r--r-- | 27.4 KB |
logfile.h | -rw-r--r-- | 12.8 KB |
malloc.h | -rw-r--r-- | 2.3 KB |
mft.c | -rw-r--r-- | 98.7 KB |
mft.h | -rw-r--r-- | 3.2 KB |
mst.c | -rw-r--r-- | 6.2 KB |
namei.c | -rw-r--r-- | 13.3 KB |
ntfs.h | -rw-r--r-- | 4.2 KB |
quota.c | -rw-r--r-- | 2.9 KB |
quota.h | -rw-r--r-- | 432 bytes |
runlist.c | -rw-r--r-- | 58.7 KB |
runlist.h | -rw-r--r-- | 2.6 KB |
super.c | -rw-r--r-- | 98.8 KB |
sysctl.c | -rw-r--r-- | 1.5 KB |
sysctl.h | -rw-r--r-- | 613 bytes |
time.h | -rw-r--r-- | 2.8 KB |
types.h | -rw-r--r-- | 1.3 KB |
unistr.c | -rw-r--r-- | 11.4 KB |
upcase.c | -rw-r--r-- | 3.1 KB |
usnjrnl.c | -rw-r--r-- | 1.9 KB |
usnjrnl.h | -rw-r--r-- | 8.4 KB |
volume.h | -rw-r--r-- | 6.1 KB |
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