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f2fs: add key functions for f2fs_io_tracer
authorJaegeuk Kim <jaegeuk@kernel.org>
Thu, 18 Dec 2014 03:51:57 +0000 (19:51 -0800)
committerJaegeuk Kim <jaegeuk@kernel.org>
Sat, 10 Jan 2015 01:02:24 +0000 (17:02 -0800)
This patch adds two key functions to trace process ids and IOs.
The basic idea is to
1. remain process ids, pids, in page->private.
2. show pids in IO traces.

So, later we can retrieve process information according to IO traces.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

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