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 |
---|---|---|
Kconfig | -rw-r--r-- | 7.8 KB |
Makefile | -rw-r--r-- | 891 bytes |
block.c | -rw-r--r-- | 4.9 KB |
cache.c | -rw-r--r-- | 11.0 KB |
decompressor.c | -rw-r--r-- | 3.3 KB |
decompressor.h | -rw-r--r-- | 1.3 KB |
decompressor_multi.c | -rw-r--r-- | 4.5 KB |
decompressor_multi_percpu.c | -rw-r--r-- | 2.2 KB |
decompressor_single.c | -rw-r--r-- | 1.7 KB |
dir.c | -rw-r--r-- | 5.2 KB |
export.c | -rw-r--r-- | 4.0 KB |
file.c | -rw-r--r-- | 13.5 KB |
file_cache.c | -rw-r--r-- | 887 bytes |
file_direct.c | -rw-r--r-- | 4.1 KB |
fragment.c | -rw-r--r-- | 2.6 KB |
id.c | -rw-r--r-- | 2.3 KB |
inode.c | -rw-r--r-- | 11.8 KB |
lz4_wrapper.c | -rw-r--r-- | 2.8 KB |
lzo_wrapper.c | -rw-r--r-- | 2.4 KB |
namei.c | -rw-r--r-- | 6.8 KB |
page_actor.c | -rw-r--r-- | 2.5 KB |
page_actor.h | -rw-r--r-- | 1.9 KB |
squashfs.h | -rw-r--r-- | 3.4 KB |
squashfs_fs.h | -rw-r--r-- | 10.3 KB |
squashfs_fs_i.h | -rw-r--r-- | 764 bytes |
squashfs_fs_sb.h | -rw-r--r-- | 1.5 KB |
super.c | -rw-r--r-- | 12.9 KB |
symlink.c | -rw-r--r-- | 3.0 KB |
xattr.c | -rw-r--r-- | 6.7 KB |
xattr.h | -rw-r--r-- | 923 bytes |
xattr_id.c | -rw-r--r-- | 2.0 KB |
xz_wrapper.c | -rw-r--r-- | 3.6 KB |
zlib_wrapper.c | -rw-r--r-- | 2.4 KB |
zstd_wrapper.c | -rw-r--r-- | 2.9 KB |
![swh spinner](/static/img/swh-spinner.gif)
Computing file changes ...