From: Alexey Dobriyan <adobriyan@gmail.com>
To: akpm@linux-foundation.org
Cc: adobriyan@gmail.com, linux-kernel@vger.kernel.org,
linux-fsdevel@vger.kernel.org, pmladek@suse.com,
rostedt@goodmis.org, sergey.senozhatsky@gmail.com,
andriy.shevchenko@linux.intel.com, linux@rasmusvillemoes.dk
Subject: [PATCH 08/15] print_integer, proc: rewrite /proc/uptime via print_integer()
Date: Mon, 20 Apr 2020 23:57:36 +0300 [thread overview]
Message-ID: <20200420205743.19964-8-adobriyan@gmail.com> (raw)
In-Reply-To: <20200420205743.19964-1-adobriyan@gmail.com>
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
---
fs/proc/uptime.c | 24 +++++++++++++++++++-----
1 file changed, 19 insertions(+), 5 deletions(-)
diff --git a/fs/proc/uptime.c b/fs/proc/uptime.c
index 5a1b228964fb..a8190078d595 100644
--- a/fs/proc/uptime.c
+++ b/fs/proc/uptime.c
@@ -8,10 +8,14 @@
#include <linux/time_namespace.h>
#include <linux/kernel_stat.h>
+#include "../../lib/print-integer.h"
+
static int uptime_proc_show(struct seq_file *m, void *v)
{
struct timespec64 uptime;
struct timespec64 idle;
+ char buf[(LEN_UL + 1 + 2 + 1) * 2];
+ char *p = buf + sizeof(buf);
u64 nsec;
u32 rem;
int i;
@@ -25,11 +29,21 @@ static int uptime_proc_show(struct seq_file *m, void *v)
idle.tv_sec = div_u64_rem(nsec, NSEC_PER_SEC, &rem);
idle.tv_nsec = rem;
- seq_printf(m, "%lu.%02lu %lu.%02lu\n",
- (unsigned long) uptime.tv_sec,
- (uptime.tv_nsec / (NSEC_PER_SEC / 100)),
- (unsigned long) idle.tv_sec,
- (idle.tv_nsec / (NSEC_PER_SEC / 100)));
+
+ *--p = '\n';
+ --p; /* overwritten */
+ *--p = '0';
+ (void)_print_integer_u32(p + 2, idle.tv_nsec / (NSEC_PER_SEC / 100));
+ *--p = '.';
+ p = _print_integer_ul(p, (unsigned long)idle.tv_sec);
+ *--p = ' ';
+ --p; /* overwritten */
+ *--p = '0';
+ (void)_print_integer_u32(p + 2, uptime.tv_nsec / (NSEC_PER_SEC / 100));
+ *--p = '.';
+ p = _print_integer_ul(p, (unsigned long)uptime.tv_sec);
+
+ seq_write(m, p, buf + sizeof(buf) - p);
return 0;
}
--
2.24.1
next prev parent reply other threads:[~2020-04-20 20:58 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-20 20:57 [PATCH 01/15] sched: make nr_running() return "unsigned int" Alexey Dobriyan
2020-04-20 20:57 ` [PATCH 02/15] sched: make nr_iowait_cpu() " Alexey Dobriyan
2020-04-20 20:57 ` [PATCH 03/15] print_integer: new and improved way of printing integers Alexey Dobriyan
2020-04-20 21:19 ` Andy Shevchenko
2020-04-20 21:27 ` Andy Shevchenko
2020-04-21 1:54 ` Steven Rostedt
2020-04-21 16:49 ` Alexey Dobriyan
2020-04-21 21:08 ` Steven Rostedt
2020-04-23 3:42 ` Sergey Senozhatsky
2020-04-21 16:31 ` Alexey Dobriyan
2020-04-21 16:59 ` Matthew Wilcox
2020-04-20 20:57 ` [PATCH 04/15] print_integer, proc: rewrite /proc/self via print_integer() Alexey Dobriyan
2020-04-20 20:57 ` [PATCH 05/15] print_integer, proc: rewrite /proc/thread-self " Alexey Dobriyan
2020-04-20 20:57 ` [PATCH 06/15] print_integer, proc: rewrite /proc/loadavg " Alexey Dobriyan
2020-04-20 20:57 ` [PATCH 07/15] print_integer, proc: rewrite /proc/stat " Alexey Dobriyan
2020-04-20 20:57 ` Alexey Dobriyan [this message]
2020-04-20 20:57 ` [PATCH 09/15] proc: s/p/tsk/ Alexey Dobriyan
2020-04-20 20:57 ` [PATCH 10/15] print_integer, proc: rewrite /proc/*/fd via print_integer() Alexey Dobriyan
2020-04-20 20:57 ` [PATCH 11/15] print_integer, proc: rewrite /proc/*/stat " Alexey Dobriyan
2020-04-20 20:57 ` [PATCH 12/15] print_integer, proc: rewrite /proc/*/statm " Alexey Dobriyan
2020-04-20 20:57 ` [PATCH 13/15] print_integer, printf: rewrite num_to_str() " Alexey Dobriyan
2020-04-20 20:57 ` [PATCH 14/15] print_integer, printf: rewrite the rest of lib/vsprintf.c " Alexey Dobriyan
2020-04-21 2:01 ` Steven Rostedt
2020-04-20 20:57 ` [PATCH 15/15] print_integer, proc: rewrite /proc/meminfo " Alexey Dobriyan
2020-04-20 21:05 ` [PATCH 01/15] sched: make nr_running() return "unsigned int" Matthew Wilcox
2020-04-21 17:06 ` Alexey Dobriyan
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