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Date: Wed, 15 Nov 2006 19:15:52 -0800
From: Edward Falk <efalk@...gle.com>
To: linux-kernel@...r.kernel.org, jens.axboe@...cle.com
CC: Andrew Morton <akpm@...l.org>
Subject: [PATCH] Introduce block I/O performance histograms
This patch introduces performance histogram record keeping for block
I/O, used for performance tuning. It is turned off by default.
When turned on, you simply do something like:
# cat /sys/block/sda/read_request_histo
rows = bytes columns = ms
10 20 50 100 200 500 1000 2000
2048 5 0 0 0 0 0 0 0
4096 0 0 0 0 0 0 0 0
8192 17231 135 41 10 0 0 0 0
16384 4400 24 6 2 0 0 0 0
32768 2897 34 4 4 0 0 0 0
65536 7089 87 5 1 2 0 0 0
#
Signed-off-by: Edward A. Falk <efalk@...gle.com>
View attachment "block_histogram.patch" of type "text/plain" (14620 bytes)
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