Roman Penyaev 474328c06e kselftests: introduce new epoll60 testcase for catching lost wakeups ... This test case catches lost wake up introduced by commit 339ddb53d3 ("fs/epoll: remove unnecessary wakeups of nested epoll") The test is simple: we have 10 threads and 10 event fds. Each thread can harvest only 1 event. 1 producer fires all 10 events at once and waits that all 10 events will be observed by 10 threads. In case of lost wakeup epoll_wait() will timeout and 0 will be returned. Test case catches two sort of problems: forgotten wakeup on event, which hits the ->ovflist list, this problem was fixed by: 5a2513239750 ("eventpoll: fix missing wakeup for ovflist in ep_poll_callback") the other problem is when several sequential events hit the same waiting thread, thus other waiters get no wakeups. Problem is fixed in the following patch. Signed-off-by: Roman Penyaev <rpenyaev@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: Khazhismel Kumykov <khazhy@google.com> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Heiher <r@hev.cc> Cc: Jason Baron <jbaron@akamai.com> Link: http://lkml.kernel.org/r/20200430130326.1368509-1-rpenyaev@suse.de Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2020-05-07 19:27:21 -07:00
..
binderfs	Char/Misc driver patches for 5.7-rc1	2020-04-03 13:22:40 -07:00
epoll	kselftests: introduce new epoll60 testcase for catching lost wakeups	2020-05-07 19:27:21 -07:00
.gitignore	.gitignore: add SPDX License Identifier	2020-03-25 11:50:48 +01:00
devpts_pts.c	selftests: filesystems: return Kselftest Skip code for skipped tests	2018-05-30 15:21:52 -06:00
dnotify_test.c
Makefile	selftests/filesystems: devpts_pts included wrong header	2018-05-30 15:21:51 -06:00