From: Wu Fengguang <fengguang.wu@intel.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Christoph Lameter <cl@linux.com>,
Andi Kleen <andi@firstfloor.org>, Ingo Molnar <mingo@elte.hu>,
Jens Axboe <axboe@kernel.dk>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Rik van Riel <riel@redhat.com>,
Linux Memory Management List <linux-mm@kvack.org>,
linux-fsdevel@vger.kernel.org,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 6/9] readahead: add /debug/readahead/stats
Date: Sun, 29 Jan 2012 13:07:22 +0800 [thread overview]
Message-ID: <20120129050722.GC26244@localhost> (raw)
In-Reply-To: <20120127121551.acd256aa.akpm@linux-foundation.org>
On Fri, Jan 27, 2012 at 12:15:51PM -0800, Andrew Morton wrote:
> > The accounting code will be compiled in by default
> > (CONFIG_READAHEAD_STATS=y), and will remain inactive by default.
>
> I agree with those choices. They effectively mean that the stats will
> be a developer-only/debugger-only thing. So even if the atomic_inc()
> costs are measurable during these develop/debug sessions, is anyone
> likely to care?
Sorry I have changed the default to CONFIG_READAHEAD_STATS=n to avoid
bloating the kernel (and forgot to edit the changelog accordingly).
I'm not sure how many people are going to check the readahead stats.
Thanks,
Fengguang
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next prev parent reply other threads:[~2012-01-29 5:07 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-27 3:05 [PATCH 0/9] readahead stats/tracing, backwards prefetching and more (v4) Wu Fengguang
2012-01-27 3:05 ` [PATCH 1/9] readahead: make context readahead more conservative Wu Fengguang
2012-01-27 3:05 ` [PATCH 2/9] readahead: record readahead patterns Wu Fengguang
2012-01-27 3:05 ` [PATCH 3/9] readahead: tag mmap page fault call sites Wu Fengguang
2012-01-27 3:05 ` [PATCH 4/9] readahead: tag metadata " Wu Fengguang
2012-01-27 3:05 ` [PATCH 5/9] readahead: add vfs/readahead tracing event Wu Fengguang
2012-01-27 3:05 ` [PATCH 6/9] readahead: add /debug/readahead/stats Wu Fengguang
2012-01-27 16:21 ` Christoph Lameter
2012-01-27 20:15 ` Andrew Morton
2012-01-29 5:07 ` Wu Fengguang [this message]
2012-01-30 4:02 ` Dave Chinner
2012-01-27 3:05 ` [PATCH 7/9] readahead: basic support for backwards prefetching Wu Fengguang
2012-01-27 3:05 ` [PATCH 8/9] readahead: dont do start-of-file readahead after lseek() Wu Fengguang
2012-01-27 3:05 ` [PATCH 9/9] readahead: snap readahead request to EOF Wu Fengguang
2012-02-09 3:22 ` [PATCH 6/9 update changelog] readahead: add /debug/readahead/stats Wu Fengguang
-- strict thread matches above, loose matches on Subject: below --
2012-02-11 4:31 [PATCH 0/9] readahead stats/tracing, backwards prefetching and more (v5) Wu Fengguang
2012-02-11 4:31 ` [PATCH 6/9] readahead: add /debug/readahead/stats Wu Fengguang
2011-11-29 13:09 [PATCH 0/9] readahead stats/tracing, backwards prefetching and more (v2) Wu Fengguang
2011-11-29 13:09 ` [PATCH 6/9] readahead: add /debug/readahead/stats Wu Fengguang
2011-11-29 15:21 ` Jan Kara
2011-11-30 0:44 ` Wu Fengguang
2011-12-14 6:36 ` Wu Fengguang
2011-12-19 16:32 ` Jan Kara
2011-12-21 1:29 ` Wu Fengguang
2011-12-21 4:06 ` Dave Chinner
2011-12-23 3:33 ` Wu Fengguang
2011-12-23 11:16 ` Jan Kara
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