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https://github.com/rd-stuffs/msm-4.14.git
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ab9961756e
seq_put_hex_ll() prints a number in hexadecimal notation and works
faster than seq_printf().
== test.py
num = 0
with open("/proc/1/maps") as f:
while num < 10000 :
data = f.read()
f.seek(0, 0)
num = num + 1
==
== Before patch ==
$ time python test.py
real 0m1.561s
user 0m0.257s
sys 0m1.302s
== After patch ==
$ time python test.py
real 0m0.986s
user 0m0.279s
sys 0m0.707s
$ perf -g record python test.py:
== Before patch ==
- 67.42% 2.82% python [kernel.kallsyms] [k] show_map_vma.isra.22
- 64.60% show_map_vma.isra.22
- 44.98% seq_printf
- seq_vprintf
- vsnprintf
+ 14.85% number
+ 12.22% format_decode
5.56% memcpy_erms
+ 15.06% seq_path
+ 4.42% seq_pad
+ 2.45% __GI___libc_read
== After patch ==
- 47.35% 3.38% python [kernel.kallsyms] [k] show_map_vma.isra.23
- 43.97% show_map_vma.isra.23
+ 20.84% seq_path
- 15.73% show_vma_header_prefix
10.55% seq_put_hex_ll
+ 2.65% seq_put_decimal_ull
0.95% seq_putc
+ 6.96% seq_pad
+ 2.94% __GI___libc_read
[avagin@openvz.org: use unsigned int instead of int where it is suitable]
Link: http://lkml.kernel.org/r/20180214025619.4005-1-avagin@openvz.org
[avagin@openvz.org: v2]
Link: http://lkml.kernel.org/r/20180117082050.25406-1-avagin@openvz.org
Link: http://lkml.kernel.org/r/20180112185812.7710-1-avagin@openvz.org
Signed-off-by: Andrei Vagin <avagin@openvz.org>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Panchajanya1999 <rsk52959@gmail.com>
Signed-off-by: Panchajanya1999 <panchajanya@azure-dev.live>
(cherry picked from commit 962ec0e343fc30e08568fcac42cc4ef099d30e14)
Signed-off-by: Adithya R <gh0strider.2k18.reborn@gmail.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.