linux-kernel - [PATCH 12/15] print_integer, proc: rewrite /proc/*/statm via print

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Date:   Mon, 20 Apr 2020 23:57:40 +0300
From:   Alexey Dobriyan <adobriyan@...il.com>
To:     akpm@...ux-foundation.org
Cc:     adobriyan@...il.com, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, pmladek@...e.com,
        rostedt@...dmis.org, sergey.senozhatsky@...il.com,
        andriy.shevchenko@...ux.intel.com, linux@...musvillemoes.dk
Subject: [PATCH 12/15] print_integer, proc: rewrite /proc/*/statm via print_integer()

Signed-off-by: Alexey Dobriyan <adobriyan@...il.com>
---
 fs/proc/array.c | 32 ++++++++++++++++++--------------
 1 file changed, 18 insertions(+), 14 deletions(-)

diff --git a/fs/proc/array.c b/fs/proc/array.c
index 6986f9f68ab7..16d66538fa61 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -695,24 +695,28 @@ int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns,
 		unsigned long shared = 0;
 		unsigned long text = 0;
 		unsigned long data = 0;
+		char buf[5 * LEN_UL + 9];
+		char *p = buf + sizeof(buf);
 
 		size = task_statm(mm, &shared, &text, &data, &resident);
 		mmput(mm);
 
-		/*
-		 * For quick read, open code by putting numbers directly
-		 * expected format is
-		 * seq_printf(m, "%lu %lu %lu %lu 0 %lu 0\n",
-		 *               size, resident, shared, text, data);
-		 */
-		seq_put_decimal_ull(m, "", size);
-		seq_put_decimal_ull(m, " ", resident);
-		seq_put_decimal_ull(m, " ", shared);
-		seq_put_decimal_ull(m, " ", text);
-		seq_put_decimal_ull(m, " ", 0);
-		seq_put_decimal_ull(m, " ", data);
-		seq_put_decimal_ull(m, " ", 0);
-		seq_putc(m, '\n');
+		*--p = '\n';
+		*--p = '0';
+		*--p = ' ';
+		p = _print_integer_ul(p, data);
+		*--p = ' ';
+		*--p = '0';
+		*--p = ' ';
+		p = _print_integer_ul(p, text);
+		*--p = ' ';
+		p = _print_integer_ul(p, shared);
+		*--p = ' ';
+		p = _print_integer_ul(p, resident);
+		*--p = ' ';
+		p = _print_integer_ul(p, size);
+
+		seq_write(m, p, buf + sizeof(buf) - p);
 	} else {
 		seq_write(m, "0 0 0 0 0 0 0\n", 14);
 	}
-- 
2.24.1