linux-kernel - Re: [PATCH] rwsem-spinlock: let rwsem write lock stealable

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Message-ID: <20130131143626.GB12678@yliu-dev.sh.intel.com>
Date:	Thu, 31 Jan 2013 22:36:26 +0800
From:	Yuanhan Liu <yuanhan.liu@...ux.intel.com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Michel Lespinasse <walken@...gle.com>,
	linux-kernel@...r.kernel.org, David Howells <dhowells@...hat.com>
Subject: Re: [PATCH] rwsem-spinlock: let rwsem write lock stealable

On Thu, Jan 31, 2013 at 02:12:28PM +0100, Ingo Molnar wrote:
> 
> * Yuanhan Liu <yuanhan.liu@...ux.intel.com> wrote:
> 
> > BTW, mind to tell a nice test case for mmap_sem?
> 
> this one was write-hitting on mmap_sem pretty hard, last I 
> checked:
> 
>   http://people.redhat.com/mingo/threaded-mmap-stresstest/

Thanks!

Is there any pass condition? I tested a while, at least I found no oops
or any noisy from dmesg output. Is that OK?

Well, sometimes, it will quit peacefully. Sometimes it will not.
ps -eo 'pid, state,wchan,comm' shows that it is sleeping at
futex_wait_queue_me().

NOTE: this happens both with or w/o this patch. Thus it may not an issue
introduced by this patch?

Thanks.

	--yliu

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