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proc: replace seq_printf by seq_put_smth to speed up /proc/pid/status

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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>
This commit is contained in:
Andrei Vagin 2018-04-10 16:31:26 -07:00 committed by Linus Torvalds
parent 48dffbf82d
commit d0f0223122
1 changed files with 11 additions and 5 deletions
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16
fs/proc/array.c
View File

@ -174,7 +174,8 @@ static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
if (umask >= 0)
seq_printf(m, "Umask:\t%#04o\n", umask);
seq_printf(m, "State:\t%s", get_task_state(p));
seq_puts(m, "State:\t");
seq_puts(m, get_task_state(p));
seq_put_decimal_ull(m, "\nTgid:\t", tgid);
seq_put_decimal_ull(m, "\nNgid:\t", ngid);
@ -300,8 +301,8 @@ static void render_cap_t(struct seq_file *m, const char *header,
seq_puts(m, header);
CAP_FOR_EACH_U32(__capi) {
seq_printf(m, "%08x",
a->cap[CAP_LAST_U32 - __capi]);
seq_put_hex_ll(m, NULL,
a->cap[CAP_LAST_U32 - __capi], 8);
}
seq_putc(m, '\n');
}
@ -355,7 +356,8 @@ static void task_cpus_allowed(struct seq_file *m, struct task_struct *task)
static inline void task_core_dumping(struct seq_file *m, struct mm_struct *mm)
{
seq_printf(m, "CoreDumping:\t%d\n", !!mm->core_state);
seq_put_decimal_ull(m, "CoreDumping:\t", !!mm->core_state);
seq_putc(m, '\n');
}
int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
@ -491,7 +493,11 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
/* convert nsec -> ticks */
start_time = nsec_to_clock_t(task->real_start_time);
seq_printf(m, "%d (%s) %c", pid_nr_ns(pid, ns), tcomm, state);
seq_put_decimal_ull(m, "", pid_nr_ns(pid, ns));
seq_puts(m, " (");
seq_puts(m, tcomm);
seq_puts(m, ") ");
seq_putc(m, state);
seq_put_decimal_ll(m, " ", ppid);
seq_put_decimal_ll(m, " ", pgid);
seq_put_decimal_ll(m, " ", sid);