[PATCH 4/4] proc: replace seq_printf by seq_put_smth to speed up /proc/pid/status

[Andrei Vagin <avagin@xxxxxxxxxx>]

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

Signed-off-by: Andrei Vagin <avagin@xxxxxxxxxx>
---
 fs/proc/array.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/fs/proc/array.c b/fs/proc/array.c
index 598803576e4c..0a61affe1356 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -187,7 +187,8 @@ static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
 	task_unlock(p);
 	rcu_read_unlock();
 
-	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);
@@ -313,8 +314,8 @@ 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');
 }
@@ -368,7 +369,8 @@ 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,
@@ -504,7 +506,11 @@ 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);
-- 
2.13.6