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From: Pavel Begunkov <[email protected]>
To: [email protected]
Cc: Jens Axboe <[email protected]>, [email protected]
Subject: [PATCH v3 0/2] poll_refs armoring
Date: Sun, 20 Nov 2022 16:57:40 +0000	[thread overview]
Message-ID: <[email protected]> (raw)

Make poll_refs more robust and protected from overflows. The mechanism
description is in 2/2. 1/2 helps to make the second patch a little bit
cleaner by tunnelling all edge cases from arming to a tw.

A good way to test is to set IO_POLL_REF_BIAS to 0 and 1. 0 will make
the slowpath to be hit every single time, and 1 triggers it in case of
races.

v2: clear the retry flag before vfs_poll()
v3: fix not handling arm_poll* refs release edge cases with patch 1/2

Pavel Begunkov (2):
  io_uring: cmpxchg for poll arm refs release
  io_uring: make poll refs more robust

 io_uring/poll.c | 44 ++++++++++++++++++++++++++++++++++++++------
 1 file changed, 38 insertions(+), 6 deletions(-)

-- 
2.38.1


             reply	other threads:[~2022-11-20 16:58 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-11-20 16:57 Pavel Begunkov [this message]
2022-11-20 16:57 ` [PATCH v3 1/2] io_uring: cmpxchg for poll arm refs release Pavel Begunkov
2022-11-25 13:51   ` Pavel Begunkov
2022-11-25 13:55     ` Jens Axboe
2022-11-20 16:57 ` [PATCH v3 2/2] io_uring: make poll refs more robust Pavel Begunkov
2022-11-21 17:10 ` [PATCH v3 0/2] poll_refs armoring Jens Axboe

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