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d0f0223122
linux/fs/proc
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Andrei Vagin d0f0223122 proc: replace seq_printf by seq_put_smth to speed up /proc/pid/status 
seq_printf() works slower than seq_puts, seq_puts, etc.

== test_proc.c
int main(int argc, char **argv)
{
	int n, i, fd;
	char buf[16384];

	n = atoi(argv[1]);
	for (i = 0; i < n; i++) {
		fd = open(argv[2], O_RDONLY);
		if (fd < 0)
			return 1;
		if (read(fd, buf, sizeof(buf)) <= 0)
			return 1;
		close(fd);
	}

	return 0;
}
==

$ time ./test_proc  1000000 /proc/1/status

== Before path ==
real	0m5.171s
user	0m0.328s
sys	0m4.783s

== After patch ==
real	0m4.761s
user	0m0.334s
sys	0m4.366s

Link: http://lkml.kernel.org/r/20180212074931.7227-4-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>
2018-04-11 10:28:33 -07:00
..
array.c proc: replace seq_printf by seq_put_smth to speed up /proc/pid/status 2018-04-11 10:28:33 -07:00
base.c procfs: remove CONFIG_HARDWALL dependency 2018-03-16 10:56:08 +01:00
cmdline.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
consoles.c fs/proc/consoles.c: use seq_putc() in show_console_dev() 2018-02-06 18:32:44 -08:00
cpuinfo.c x86 / CPU: Always show current CPU frequency in /proc/cpuinfo 2017-11-15 19:46:50 +01:00
devices.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
fd.c proc: use %u for pid printing and slightly less stack 2018-02-06 18:32:43 -08:00
fd.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
generic.c proc: rearrange args 2018-02-06 18:32:43 -08:00
inode.c proc: account "struct pde_opener" 2018-04-11 10:28:33 -07:00
internal.h proc: move "struct pde_opener" to kmem cache 2018-04-11 10:28:33 -07:00
interrupts.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
Kconfig fs, proc: add help for CONFIG_PROC_CHILDREN 2015-07-17 16:39:52 -07:00
kcore.c vfs/proc/kcore, x86/mm/kcore: Fix SMAP fault when dumping vsyscall user page 2018-02-13 09:15:58 +01:00
kmsg.c vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
loadavg.c pid: replace pid bitmap implementation with IDR API 2017-11-17 16:10:03 -08:00
Makefile proc: : uninline name_to_int() 2017-11-17 16:10:00 -08:00
meminfo.c proc: add seq_put_decimal_ull_width to speed up /proc/pid/smaps 2018-04-11 10:28:33 -07:00
namespaces.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
nommu.c Replace <asm/uaccess.h> with <linux/uaccess.h> globally 2016-12-24 11:46:01 -08:00
page.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
proc_net.c proc: rearrange args 2018-02-06 18:32:43 -08:00
proc_sysctl.c vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
proc_tty.c TTY/Serial patches for 4.15-rc1 2017-11-13 21:05:31 -08:00
root.c proc: move "struct pde_opener" to kmem cache 2018-04-11 10:28:33 -07:00
self.c fs/proc: use __ro_after_init 2018-02-06 18:32:43 -08:00
softirqs.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
stat.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
task_mmu.c proc: replace seq_printf on seq_putc to speed up /proc/pid/smaps 2018-04-11 10:28:33 -07:00
task_nommu.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
thread_self.c fs/proc: use __ro_after_init 2018-02-06 18:32:43 -08:00
uptime.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
util.c proc: use do-while in name_to_int() 2017-11-17 16:10:00 -08:00
version.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
vmcore.c fs/proc/vmcore.c: simpler /proc/vmcore cleanup 2018-02-06 18:32:43 -08:00