linux-kernel - Re: [PATCH -next] locking/rwsem: don't spin in heavy contention

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Message-ID: <CACVXFVNnaS-sDyBLpwZCPSXe5NFw7BqurB4OTGZf8Mx_MMDhPA@mail.gmail.com>
Date:	Sat, 7 Mar 2015 19:47:58 +0800
From:	Ming Lei <ming.lei@...onical.com>
To:	Dave Chinner <david@...morbit.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Davidlohr Bueso <dbueso@...e.de>,
	"Peter Zijlstra (Intel)" <peterz@...radead.org>,
	Jason Low <jason.low2@...com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Michel Lespinasse <walken@...gle.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Tim Chen <tim.c.chen@...ux.intel.com>,
	Ingo Molnar <mingo@...nel.org>, "Theodore Ts'o" <tytso@....edu>
Subject: Re: [PATCH -next] locking/rwsem: don't spin in heavy contention

On Sat, Mar 7, 2015 at 5:54 AM, Dave Chinner <david@...morbit.com> wrote:
>
> If you're getting stuff there, I'd be looking for a bug in ext4, not
> the rwsem code. There's no way there should be enough unwritten
> extent conversion pending to lock up the system for that length of
> time. Especially considering the test has concurrent truncates

The time is taken for spinning rwsem, so it is really a rwsem problem,
and Jason Low has posted one patch to fix it.

Thanks,
Ming Lei
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