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>
1 parent bb65f89
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 |
---|---|---|
cluster | ||
dlm | ||
dlmfs | ||
Kconfig | -rw-r--r-- | 2.5 KB |
Makefile | -rw-r--r-- | 1.0 KB |
acl.c | -rw-r--r-- | 9.1 KB |
acl.h | -rw-r--r-- | 776 bytes |
alloc.c | -rw-r--r-- | 195.4 KB |
alloc.h | -rw-r--r-- | 11.2 KB |
aops.c | -rw-r--r-- | 61.5 KB |
aops.h | -rw-r--r-- | 2.4 KB |
blockcheck.c | -rw-r--r-- | 15.4 KB |
blockcheck.h | -rw-r--r-- | 3.3 KB |
buffer_head_io.c | -rw-r--r-- | 11.1 KB |
buffer_head_io.h | -rw-r--r-- | 1.6 KB |
dcache.c | -rw-r--r-- | 12.5 KB |
dcache.h | -rw-r--r-- | 1.2 KB |
dir.c | -rw-r--r-- | 113.5 KB |
dir.h | -rw-r--r-- | 3.2 KB |
dlmglue.c | -rw-r--r-- | 125.0 KB |
dlmglue.h | -rw-r--r-- | 6.7 KB |
export.c | -rw-r--r-- | 6.2 KB |
export.h | -rw-r--r-- | 392 bytes |
extent_map.c | -rw-r--r-- | 23.6 KB |
extent_map.h | -rw-r--r-- | 2.3 KB |
file.c | -rw-r--r-- | 65.4 KB |
file.h | -rw-r--r-- | 2.3 KB |
filecheck.c | -rw-r--r-- | 12.0 KB |
filecheck.h | -rw-r--r-- | 1.9 KB |
heartbeat.c | -rw-r--r-- | 2.8 KB |
heartbeat.h | -rw-r--r-- | 828 bytes |
inode.c | -rw-r--r-- | 45.4 KB |
inode.h | -rw-r--r-- | 5.3 KB |
ioctl.c | -rw-r--r-- | 22.4 KB |
ioctl.h | -rw-r--r-- | 369 bytes |
journal.c | -rw-r--r-- | 61.4 KB |
journal.h | -rw-r--r-- | 22.2 KB |
localalloc.c | -rw-r--r-- | 33.3 KB |
localalloc.h | -rw-r--r-- | 1.5 KB |
locks.c | -rw-r--r-- | 2.8 KB |
locks.h | -rw-r--r-- | 471 bytes |
mmap.c | -rw-r--r-- | 4.3 KB |
mmap.h | -rw-r--r-- | 173 bytes |
move_extents.c | -rw-r--r-- | 25.2 KB |
move_extents.h | -rw-r--r-- | 363 bytes |
namei.c | -rw-r--r-- | 69.3 KB |
namei.h | -rw-r--r-- | 1.1 KB |
ocfs1_fs_compat.h | -rw-r--r-- | 2.3 KB |
ocfs2.h | -rw-r--r-- | 24.6 KB |
ocfs2_fs.h | -rw-r--r-- | 49.6 KB |
ocfs2_ioctl.h | -rw-r--r-- | 6.5 KB |
ocfs2_lockid.h | -rw-r--r-- | 2.7 KB |
ocfs2_lockingver.h | -rw-r--r-- | 562 bytes |
ocfs2_trace.h | -rw-r--r-- | 75.8 KB |
quota.h | -rw-r--r-- | 4.6 KB |
quota_global.c | -rw-r--r-- | 29.8 KB |
quota_local.c | -rw-r--r-- | 35.5 KB |
refcounttree.c | -rw-r--r-- | 120.2 KB |
refcounttree.h | -rw-r--r-- | 4.4 KB |
reservations.c | -rw-r--r-- | 20.0 KB |
reservations.h | -rw-r--r-- | 4.9 KB |
resize.c | -rw-r--r-- | 15.5 KB |
resize.h | -rw-r--r-- | 444 bytes |
slot_map.c | -rw-r--r-- | 11.6 KB |
slot_map.h | -rw-r--r-- | 769 bytes |
stack_o2cb.c | -rw-r--r-- | 11.2 KB |
stack_user.c | -rw-r--r-- | 28.9 KB |
stackglue.c | -rw-r--r-- | 17.0 KB |
stackglue.h | -rw-r--r-- | 8.8 KB |
suballoc.c | -rw-r--r-- | 74.6 KB |
suballoc.h | -rw-r--r-- | 6.9 KB |
super.c | -rw-r--r-- | 68.4 KB |
super.h | -rw-r--r-- | 911 bytes |
symlink.c | -rw-r--r-- | 2.5 KB |
symlink.h | -rw-r--r-- | 634 bytes |
sysfile.c | -rw-r--r-- | 4.1 KB |
sysfile.h | -rw-r--r-- | 416 bytes |
uptodate.c | -rw-r--r-- | 17.0 KB |
uptodate.h | -rw-r--r-- | 2.3 KB |
xattr.c | -rw-r--r-- | 192.9 KB |
xattr.h | -rw-r--r-- | 3.1 KB |
![swh spinner](/static/img/swh-spinner.gif)
Computing file changes ...