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Date: Fri, 30 Jun 2017 19:48:17 -0700
From: Joe Perches <joe@...ches.com>
To: Alexey Dobriyan <adobriyan@...il.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
LKML <linux-kernel@...r.kernel.org>
Subject: seq_file optimization?
About this commit in mm:
---------------------------------------------------
commit c1aca87fb3f84a813fb3dda656bbee583c9c87a3
Author: Alexey Dobriyan <adobriyan@...il.com>
Date: Fri Jun 30 11:02:04 2017 +1000
fs/seq_file.c: delete small-value optimization
num_to_str() optimizes printing small integers [0..9], so the same check
higher in callchain is unnecessary.
---------------------------------------------------
Is removing this optimization really the same speed?
I don't think so.
The num_to_str call still does multiple moves of
memory to the output, this is a single byte copy.
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