From: Gilad Ben-Yossef <gilad@benyossef.com>
To: Jan Kara <jack@suse.cz>
Cc: Andrew Morton <akpm@linux-foundation.org>,
"Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>,
linux-fsdevel@vger.kernel.org,
LKML <linux-kernel@vger.kernel.org>,
hare@suse.de, Al Viro <viro@zeniv.linux.org.uk>,
Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH] vfs: Avoid IPI storm due to bh LRU invalidation
Date: Wed, 8 Feb 2012 09:09:30 +0200 [thread overview]
Message-ID: <CAOtvUMet_L9s5+jYF=_kb_N86dNmC6G1rhLQ7JzNfWC0J9UcSw@mail.gmail.com> (raw)
In-Reply-To: <20120207182926.GD1043@quack.suse.cz>
On Tue, Feb 7, 2012 at 8:29 PM, Jan Kara <jack@suse.cz> wrote:
> On Tue 07-02-12 18:25:18, Gilad Ben-Yossef wrote:
>> On Tue, Feb 7, 2012 at 12:25 AM, Jan Kara <jack@suse.cz> wrote:
...
>> I think its worth a shot since the mutex just delays the IPIs instead
>> of canceling them
>> altogether.
> Well, mutex will just delay callers but the sequence logic behind the
> mutex will reduce number of IPIs a lot - all waiters for mutex will be
> satisfied by a single signalling of all CPUs while previously they would
> each do the signalling.
Oh, you are right. I've missed that part completely. Note to self: never try to
read LKML email on your smartphone...
Gilad
--
Gilad Ben-Yossef
Chief Coffee Drinker
gilad@benyossef.com
Israel Cell: +972-52-8260388
US Cell: +1-973-8260388
http://benyossef.com
"If you take a class in large-scale robotics, can you end up in a
situation where the homework eats your dog?"
-- Jean-Baptiste Queru
WARNING: multiple messages have this Message-ID (diff)
From: Gilad Ben-Yossef <gilad@benyossef.com>
To: Jan Kara <jack@suse.cz>
Cc: Andrew Morton <akpm@linux-foundation.org>,
"Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>,
linux-fsdevel@vger.kernel.org,
LKML <linux-kernel@vger.kernel.org>,
hare@suse.de, Al Viro <viro@zeniv.linux.org.uk>,
Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH] vfs: Avoid IPI storm due to bh LRU invalidation
Date: Wed, 8 Feb 2012 09:09:30 +0200 [thread overview]
Message-ID: <CAOtvUMet_L9s5+jYF=_kb_N86dNmC6G1rhLQ7JzNfWC0J9UcSw@mail.gmail.com> (raw)
In-Reply-To: <20120207182926.GD1043@quack.suse.cz>
On Tue, Feb 7, 2012 at 8:29 PM, Jan Kara <jack@suse.cz> wrote:
> On Tue 07-02-12 18:25:18, Gilad Ben-Yossef wrote:
>> On Tue, Feb 7, 2012 at 12:25 AM, Jan Kara <jack@suse.cz> wrote:
...
>> I think its worth a shot since the mutex just delays the IPIs instead
>> of canceling them
>> altogether.
> Well, mutex will just delay callers but the sequence logic behind the
> mutex will reduce number of IPIs a lot - all waiters for mutex will be
> satisfied by a single signalling of all CPUs while previously they would
> each do the signalling.
Oh, you are right. I've missed that part completely. Note to self: never try to
read LKML email on your smartphone...
Gilad
--
Gilad Ben-Yossef
Chief Coffee Drinker
gilad@benyossef.com
Israel Cell: +972-52-8260388
US Cell: +1-973-8260388
http://benyossef.com
"If you take a class in large-scale robotics, can you end up in a
situation where the homework eats your dog?"
-- Jean-Baptiste Queru
--
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next prev parent reply other threads:[~2012-02-08 7:09 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-06 13:55 [PATCH] vfs: Avoid IPI storm due to bh LRU invalidation Jan Kara
2012-02-06 15:42 ` Srivatsa S. Bhat
2012-02-06 15:51 ` Hannes Reinecke
2012-02-06 16:47 ` Jan Kara
2012-02-06 21:17 ` Andrew Morton
2012-02-06 22:25 ` Jan Kara
2012-02-07 16:25 ` Gilad Ben-Yossef
2012-02-07 18:29 ` Jan Kara
2012-02-08 7:09 ` Gilad Ben-Yossef [this message]
2012-02-08 7:09 ` Gilad Ben-Yossef
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