linux-kernel - Re: [GIT PULL] f2fs for 5.18

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Date:   Wed, 23 Mar 2022 00:33:26 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Jaegeuk Kim <jaegeuk@...nel.org>, Waiman Long <longman@...hat.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux F2FS Dev Mailing List 
        <linux-f2fs-devel@...ts.sourceforge.net>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [GIT PULL] f2fs for 5.18

On Tue, Mar 22, 2022 at 10:22:50AM -0700, Linus Torvalds wrote:
> On Mon, Mar 21, 2022 at 1:39 PM Jaegeuk Kim <jaegeuk@...nel.org> wrote:
> >
> > In this cycle, f2fs has some performance improvements for Android workloads such
> > as using read-unfair rwsems [...]
> 
> I've pulled this, but that read-unfair rwsem code looks incredibly
> dodgy. Doing your own locking is always a bad sign, and it ahs
> traditionally come back to bite us pretty much every time. At least it
> uses real lock primitives, just in a really odd way.

FYI, Peter and I both pointed this out when the patches were posted
and NAKed the patch, but the feedback was ignored.