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From: Davidlohr Bueso <dave@stgolabs.net>
To: akpm@linux-foundation.org
Cc: jbaron@akamai.com, rpenyaev@suse.de, viro@zeniv.linux.org.uk,
	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
	dave@stgolabs.net
Subject: [PATCH 0/2] fs/epoll: restore user-visible behavior upon event ready
Date: Mon,  5 Apr 2021 16:10:23 -0700	[thread overview]
Message-ID: <20210405231025.33829-1-dave@stgolabs.net> (raw)

Hi,

This series tries to address a change in user visible behavior,
reported in:

 https://bugzilla.kernel.org/show_bug.cgi?id=208943


Epoll does not report an event to all the threads running epoll_wait()
on the same epoll descriptor. Unsurprisingly, this was bisected back to
339ddb53d373 (fs/epoll: remove unnecessary wakeups of nested epoll), which
has had various problems in the past, beyond only nested epoll usage.

Thanks!

Davidlohr Bueso (2):
  kselftest: introduce new epoll test case
  fs/epoll: restore waking from ep_done_scan()

 fs/eventpoll.c                                |  6 +++
 .../filesystems/epoll/epoll_wakeup_test.c     | 44 +++++++++++++++++++
 2 files changed, 50 insertions(+)

--
2.26.2


             reply	other threads:[~2021-04-05 23:10 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-05 23:10 Davidlohr Bueso [this message]
2021-04-05 23:10 ` [PATCH 1/2] kselftest: introduce new epoll test case Davidlohr Bueso
2021-04-05 23:10 ` [PATCH 2/2] fs/epoll: restore waking from ep_done_scan() Davidlohr Bueso
2021-04-06  1:50   ` Andrew Morton
2021-04-06  3:22     ` Davidlohr Bueso
2021-04-06  5:09       ` Andrew Morton

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