From: Arne Jansen <sensille@gmx.net>
To: Chris Mason <chris.mason@oracle.com>
Cc: linux-btrfs <linux-btrfs@vger.kernel.org>
Subject: Re: new metadata reader/writer locks in integration-test
Date: Wed, 20 Jul 2011 18:49:29 +0200 [thread overview]
Message-ID: <4E270719.6080704@gmx.net> (raw)
In-Reply-To: <4E267BD4.5030200@gmx.net>
On 20.07.2011 08:55, Arne Jansen wrote:
> Hi Chris,
>
> On 19.07.2011 19:30, Chris Mason wrote:
>> Hi everyone,
>>
>> I've pushed out a new integration-test branch, and it includes a new
>> reader/writer locking scheme for the btree locks.
>>
>
> I rebased my for-chris branch containing the readahead patches for scrub
> to your integration-test branch. It had only trivial conflicts.
> Hopefully it can go into 3.1 as well.
The readahead series contained a stupid bug I introduced in v5.
The corrected version is pushed out.
>
> -Arne
>
>> We've seen a number of benchmarks dominated by contention on the root
>> node lock. This changes our locks into a simple reader/writer lock.
>> They are based on mutexes so that we still take advantage of the mutex
>> adaptive spins for write locks (rwsemaphores were much slower).
>>
>> I'm also sending the individual commits, please do take a look.
>>
>> -chris
>
next prev parent reply other threads:[~2011-07-20 16:49 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-19 17:30 new metadata reader/writer locks in integration-test Chris Mason
2011-07-20 2:08 ` Tsutomu Itoh
2011-07-20 7:58 ` Chris Mason
2011-07-20 8:36 ` Tsutomu Itoh
2011-07-22 15:49 ` Chris Mason
2011-07-20 6:55 ` Arne Jansen
2011-07-20 16:49 ` Arne Jansen [this message]
2011-07-20 17:21 ` Chris Mason
2011-07-20 18:51 ` Chris Mason
2011-07-21 4:54 ` Li Zefan
2011-07-21 0:48 ` Tsutomu Itoh
2011-07-21 5:46 ` Arne Jansen
2011-07-22 0:53 ` Chris Mason
2011-07-22 4:06 ` Miao Xie
2011-07-22 9:12 ` Miao Xie
2011-07-21 5:44 ` Arne Jansen
2011-07-22 15:58 ` Arne Jansen
2011-07-22 15:01 ` rw_semaphore performance, was: " Christoph Hellwig
2011-07-22 15:14 ` Chris Mason
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