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authorAndrew Morton <akpm@osdl.org>2006-12-10 02:19:48 -0800
committerLinus Torvalds <torvalds@woody.osdl.org>2006-12-10 09:55:41 -0800
commitaba76fdb8a5fefba73d3490563bf7c4da37b1a34 (patch)
treeeefa514957d847d1fea1b8a76755907758867aca /include
parent98c4d57decf97bf8ddfe948a3266aa56b38b1a51 (diff)
[PATCH] io-accounting: report in procfs
Add a simple /proc/pid/io to show the IO accounting fields. Maybe this shouldn't be merged in mainline - the preferred reporting channel is taskstats. But given the poor state of our userspace support for taskstats, this is useful for developer-testing, at least. And it improves the changes that the procps developers will wire it up into top(1). Opinions are sought. The patch also wires up the existing IO-accounting fields. It's a bit racy on 32-bit machines: if process A reads process B's /proc/pid/io while process B is updating one of those 64-bit counters, process A could see an intermediate result. Cc: Jay Lan <jlan@sgi.com> Cc: Shailabh Nagar <nagar@watson.ibm.com> Cc: Balbir Singh <balbir@in.ibm.com> Cc: Chris Sturtivant <csturtiv@sgi.com> Cc: Tony Ernst <tee@sgi.com> Cc: Guillaume Thouvenin <guillaume.thouvenin@bull.net> Cc: David Wright <daw@sgi.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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