linux-kernel - [PATCH 0/2] fs, proc: optimize smaps output formatting

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Message-Id: <1471601580-17999-1-git-send-email-mhocko@kernel.org>
Date:   Fri, 19 Aug 2016 12:12:58 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Joe Perches <joe@...ches.com>, Jann Horn <jann@...jh.net>,
        <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 0/2] fs, proc: optimize smaps output formatting

Hi,
this is rebased on top of next-20160818. Joe has pointed out that
meminfo is using a similar trick so I have extracted guts of what we
have already and made it more generic to be usable for smaps as well
(patch 1). The second patch then replaces seq_printf with seq_write
and show_val_kb which should have smaller overhead and my measuring (in
kvm) shows quite a nice improvements. I hope kvm is not playing tricks
on me but I didn't get to test on a real HW.

Michal Hocko (2):
      proc, meminfo: abstract show_val_kb
      proc, smaps: reduce printing overhead

 fs/proc/internal.h | 17 ++++++++++
 fs/proc/meminfo.c  | 93 ++++++++++++++++++++++++++----------------------------
 fs/proc/task_mmu.c | 58 +++++++++++-----------------------
 3 files changed, 81 insertions(+), 87 deletions(-)