linux-kernel - [PATCH] getrusage() : Fill ru_inblock and ru

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Message-Id: <200703121820.03340.dada1@cosmosbay.com>
Date:	Mon, 12 Mar 2007 18:20:03 +0100
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] getrusage() : Fill ru_inblock and ru_oublock fields if possible

if CONFIG_TASK_IO_ACCOUNTING is defined, we update io accounting counters for 
each task.

This patch permits reporting of values using the well known getrusage() 
syscall, filling ru_inblock and ru_oublock instead of null values.

As TASK_IO_ACCOUNTING currently counts bytes counts, we approximate blocks 
count doing : nr_blocks = nr_bytes / 512

Example of use :
----------------------
After patch is applied, /usr/bin/time command can now give a good 
approximation of IO that the process had to do.

$ /usr/bin/time grep tototo /usr/include/*
Command exited with non-zero status 1
0.00user 0.02system 0:02.11elapsed 1%CPU (0avgtext+0avgdata 0maxresident)k
24288inputs+0outputs (0major+259minor)pagefaults 0swaps

$ /usr/bin/time dd if=/dev/zero of=/tmp/testfile count=1000
1000+0 enregistrements lus
1000+0 enregistrements écrits
512000 octets (512 kB) copiés, 0,00326601 seconde, 157 MB/s
0.00user 0.00system 0:00.00elapsed 80%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+3000outputs (0major+299minor)pagefaults 0swaps

Signed-off-by: Eric Dumazet <dada1@...mosbay.com>

View attachment "getrusage_add_inblock_and_oublock.patch" of type "text/plain" (2674 bytes)