From: Andi Kleen <andi@firstfloor.org>
To: Wu Fengguang <fengguang.wu@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
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 3/9] readahead: record readahead patterns
Date: Tue, 29 Nov 2011 18:57:43 +0100 [thread overview]
Message-ID: <20111129175743.GP24062@one.firstfloor.org> (raw)
In-Reply-To: <20111129131456.278516066@intel.com>
On Tue, Nov 29, 2011 at 09:09:03PM +0800, Wu Fengguang wrote:
> Record the readahead pattern in ra->pattern and extend the ra_submit()
> parameters, to be used by the next readahead tracing/stats patches.
I like this, could it be exported it a bit more formally in /proc for
each file descriptor?
I could imagine a monitoring tool that you run on a process that
tells you what pattern state the various file descriptors are in and how
large the window is. That would be similar to the tools for
monitoring network connections, which are extremly useful
in practice.
-Andi
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WARNING: multiple messages have this Message-ID (diff)
From: Andi Kleen <andi@firstfloor.org>
To: Wu Fengguang <fengguang.wu@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
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 3/9] readahead: record readahead patterns
Date: Tue, 29 Nov 2011 18:57:43 +0100 [thread overview]
Message-ID: <20111129175743.GP24062@one.firstfloor.org> (raw)
In-Reply-To: <20111129131456.278516066@intel.com>
On Tue, Nov 29, 2011 at 09:09:03PM +0800, Wu Fengguang wrote:
> Record the readahead pattern in ra->pattern and extend the ra_submit()
> parameters, to be used by the next readahead tracing/stats patches.
I like this, could it be exported it a bit more formally in /proc for
each file descriptor?
I could imagine a monitoring tool that you run on a process that
tells you what pattern state the various file descriptors are in and how
large the window is. That would be similar to the tools for
monitoring network connections, which are extremly useful
in practice.
-Andi
next prev parent reply other threads:[~2011-11-29 17:57 UTC|newest]
Thread overview: 93+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-29 13:09 [PATCH 0/9] readahead stats/tracing, backwards prefetching and more (v2) Wu Fengguang
2011-11-29 13:09 ` Wu Fengguang
2011-11-29 13:09 ` [PATCH 1/9] block: limit default readahead size for small devices Wu Fengguang
2011-11-29 13:09 ` Wu Fengguang
2011-11-29 13:09 ` Wu Fengguang
2011-11-29 13:09 ` [PATCH 2/9] readahead: snap readahead request to EOF Wu Fengguang
2011-11-29 13:09 ` Wu Fengguang
2011-11-29 13:09 ` Wu Fengguang
2011-11-29 14:29 ` Jan Kara
2011-11-29 14:29 ` Jan Kara
2011-11-30 1:06 ` Wu Fengguang
2011-11-30 1:06 ` Wu Fengguang
2011-11-30 11:37 ` Jan Kara
2011-11-30 11:37 ` Jan Kara
2011-11-30 12:06 ` Wu Fengguang
2011-11-30 12:06 ` Wu Fengguang
2011-11-29 13:09 ` [PATCH 3/9] readahead: record readahead patterns Wu Fengguang
2011-11-29 13:09 ` Wu Fengguang
2011-11-29 13:09 ` Wu Fengguang
2011-11-29 14:40 ` Jan Kara
2011-11-29 14:40 ` Jan Kara
2011-11-29 17:57 ` Andi Kleen [this message]
2011-11-29 17:57 ` Andi Kleen
2011-11-30 1:18 ` Wu Fengguang
2011-11-30 1:18 ` Wu Fengguang
2011-12-15 8:55 ` [PATCH] proc: show readahead state in fdinfo Wu Fengguang
2011-12-15 8:55 ` Wu Fengguang
2011-12-15 9:49 ` Ingo Molnar
2011-12-15 9:49 ` Ingo Molnar
2011-11-29 13:09 ` [PATCH 4/9] readahead: tag mmap page fault call sites Wu Fengguang
2011-11-29 13:09 ` Wu Fengguang
2011-11-29 13:09 ` Wu Fengguang
2011-11-29 14:41 ` Jan Kara
2011-11-29 14:41 ` Jan Kara
2011-11-29 13:09 ` [PATCH 5/9] readahead: tag metadata " Wu Fengguang
2011-11-29 13:09 ` Wu Fengguang
2011-11-29 13:09 ` Wu Fengguang
2011-11-29 14:45 ` Jan Kara
2011-11-29 14:45 ` Jan Kara
2011-11-29 13:09 ` [PATCH 6/9] readahead: add /debug/readahead/stats Wu Fengguang
2011-11-29 13:09 ` Wu Fengguang
2011-11-29 13:09 ` Wu Fengguang
2011-11-29 15:21 ` Jan Kara
2011-11-29 15:21 ` Jan Kara
2011-11-30 0:44 ` Wu Fengguang
2011-11-30 0:44 ` Wu Fengguang
2011-12-14 6:36 ` Wu Fengguang
2011-12-14 6:36 ` Wu Fengguang
2011-12-19 16:32 ` Jan Kara
2011-12-19 16:32 ` Jan Kara
2011-12-21 1:29 ` Wu Fengguang
2011-12-21 1:29 ` Wu Fengguang
2011-12-21 4:06 ` Dave Chinner
2011-12-21 4:06 ` Dave Chinner
2011-12-23 3:33 ` Wu Fengguang
2011-12-23 3:33 ` Wu Fengguang
2011-12-23 11:16 ` Jan Kara
2011-12-23 11:16 ` Jan Kara
2011-11-29 13:09 ` [PATCH 7/9] readahead: add vfs/readahead tracing event Wu Fengguang
2011-11-29 13:09 ` Wu Fengguang
2011-11-29 13:09 ` Wu Fengguang
2011-11-29 15:22 ` Jan Kara
2011-11-29 15:22 ` Jan Kara
2011-11-30 0:42 ` Wu Fengguang
2011-11-30 0:42 ` Wu Fengguang
2011-11-30 11:44 ` Jan Kara
2011-11-30 11:44 ` Jan Kara
2011-11-30 12:06 ` Wu Fengguang
2011-11-30 12:06 ` Wu Fengguang
2011-12-06 15:30 ` Christoph Hellwig
2011-12-06 15:30 ` Christoph Hellwig
2011-12-07 9:18 ` Wu Fengguang
2011-12-07 9:18 ` Wu Fengguang
2011-12-08 9:03 ` [PATCH] writeback: show writeback reason with __print_symbolic Wu Fengguang
2011-12-08 9:03 ` Wu Fengguang
2011-11-29 13:09 ` [PATCH 8/9] readahead: basic support for backwards prefetching Wu Fengguang
2011-11-29 13:09 ` Wu Fengguang
2011-11-29 13:09 ` Wu Fengguang
2011-11-29 15:35 ` Jan Kara
2011-11-29 15:35 ` Jan Kara
2011-11-29 16:37 ` Pádraig Brady
2011-11-29 16:37 ` Pádraig Brady
2011-11-29 16:37 ` Pádraig Brady
2011-11-30 0:24 ` Wu Fengguang
2011-11-30 0:24 ` Wu Fengguang
2011-11-30 0:24 ` Wu Fengguang
2011-11-30 0:37 ` Wu Fengguang
2011-11-30 0:37 ` Wu Fengguang
2011-11-30 11:21 ` Jan Kara
2011-11-30 11:21 ` Jan Kara
2011-11-29 13:09 ` [PATCH 9/9] readahead: dont do start-of-file readahead after lseek() Wu Fengguang
2011-11-29 13:09 ` Wu Fengguang
2011-11-29 13:09 ` Wu Fengguang
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