linux-kernel - Re: [PATCH 2/2] eventpoll: Fix epoll

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Message-ID: <87qzvz9f55.fsf@yellow.woof>
Date: Mon, 22 Sep 2025 08:26:30 +0200
From: Nam Cao <namcao@...utronix.de>
To: Mateusz Guzik <mjguzik@...il.com>, Khazhy Kumykov <khazhy@...omium.org>
Cc: Alexander Viro <viro@...iv.linux.org.uk>, Christian Brauner
 <brauner@...nel.org>, Jan Kara <jack@...e.cz>, Shuah Khan
 <shuah@...nel.org>, Davidlohr Bueso <dave@...olabs.net>, Soheil Hassas
 Yeganeh <soheil@...gle.com>, Willem de Bruijn <willemb@...gle.com>, Eric
 Dumazet <edumazet@...gle.com>, Jens Axboe <axboe@...nel.dk>,
 linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-kselftest@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH 2/2] eventpoll: Fix epoll_wait() report false negative

Mateusz Guzik <mjguzik@...il.com> writes:
> a sequence counter around shenanigans will sort it out, but I don't
> know if it is worth it and don't really want to investigate myself.

The original commit did mention "1% CPU/RPC reduction in RPC benchmarks".
I'm not sure what "RPC" stands for and which benchmark it is. But if it
is really important, we must have heard by now.

Nam