[PATCH -mm 0/4] task IO accounting: per block device IO statistics

[Andrea Righi]

Introduce a new file /proc/<pid>/blockio (and equivalently per-thread
/proc/<pid>/task/<tid>/blockio files) to export per block device i/o statistics
of each process to userspace applications.

The objective of this patch is to provide an efficient method to quickly
identify the top i/o consumers on specific block devices and, more in general,
to collect more detailed informations about specific block device usage.

See the documentation (PATCH 1/4) for more information.

Tested against 2.6.27-rc1-mm1.

The all-in-one patch can be found at:
http://download.systemimager.org/~arighi/linux/patches/task-io-acct-block/

-Andrea
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