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Message-ID: <4F718081.9020906@jp.fujitsu.com>
Date: Tue, 27 Mar 2012 17:55:29 +0900
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To: Linux Kernel <linux-kernel@...r.kernel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Alexey Dobriyan <adobriyan@...il.com>,
Ulrich Drepper <drepper@...il.com>
Subject: [RFC] [PATCH 2/2] add /proc/stat.bin
>From 5551c12359e0069561bb507bac7454cdfd4edeaf Mon Sep 17 00:00:00 2001
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Date: Tue, 27 Mar 2012 14:17:55 +0900
Subject: [PATCH 2/2] proc: add /proc/stat.bin
Add a binary format of /proc/stat as /proc/stat.bin.
The format is seq file's binstream. The information is shown as
folllowing..
[kamezawa@...extal linux]$ od -t x8 /proc/stat.bin
0000000 0000000400000002 0000000020757063 # string "cpu"
0000020 0000000100000004 000000000000039a # uulong 0x39a
0000040 0000000100000001 0000000500000004 # zero, 5 ents of uulong array starts..
0000060 0000000000000551 00000000000cb2e6 # 0x551, 0xcb2e6
0000100 0000000000000bf0 0000000000000082 # 0xbf0, 0x082,
0000120 000000000000007d 0000000300000001 # 0x7d, 3 zeros
0000140 0000000400000002 0000000030757063 # string "cpu0"
...
0001540 0000000400000002 0000000072746e69 # string 'intr'
0001560 0000000300000004 000000000002d28c # 3 ents of uulong array of values
0001600 00000000000000b6 0000000000000008 #
...
0002000 00000000000016aa 0000002f00000001 # ...47 zeros.
0002040 0000000100000001 0000000100000004 # zero, 1 ents of uulong
0002060 0000000000000004 0000043a00000001 # 0x4, 1082 of zeros..
...
In general, string and uulong values will have overheads of headers but
zeros are compressed...
[kamezawa@...extal linux]$ wc -c /proc/stat
2817 /proc/stat
[kamezawa@...extal linux]$ wc -c /proc/stat.bin
1392 /proc/stat.bin
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
---
fs/proc/stat.c | 79 ++++++++++++++++++++++++++++++++++++++++++++-----------
1 files changed, 63 insertions(+), 16 deletions(-)
diff --git a/fs/proc/stat.c b/fs/proc/stat.c
index 6a0c62d..5abcc52 100644
--- a/fs/proc/stat.c
+++ b/fs/proc/stat.c
@@ -100,7 +100,7 @@ static int show_stat(struct seq_file *p, void *v)
seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(steal));
seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest));
seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest_nice));
- seq_putc(p, '\n');
+ seq_put_nl(p);
for_each_online_cpu(i) {
/* Copy values here to work around gcc-2.95.3, gcc-2.96 */
@@ -125,31 +125,42 @@ static int show_stat(struct seq_file *p, void *v)
seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(steal));
seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest));
seq_put_decimal_ull(p, ' ', cputime64_to_clock_t(guest_nice));
- seq_putc(p, '\n');
+ seq_put_nl(p);
}
- seq_printf(p, "intr %llu", (unsigned long long)sum);
+ seq_puts(p, "intr");
+ seq_put_decimal_ull(p, ' ', sum);
/* sum again ? it could be updated? */
for_each_irq_nr(j)
seq_put_decimal_ull(p, ' ', kstat_irqs(j));
+ seq_put_nl(p);
- seq_printf(p,
- "\nctxt %llu\n"
- "btime %lu\n"
- "processes %lu\n"
- "procs_running %lu\n"
- "procs_blocked %lu\n",
- nr_context_switches(),
- (unsigned long)jif,
- total_forks,
- nr_running(),
- nr_iowait());
+ seq_puts(p, "ctxt");
+ seq_put_decimal_ull(p, ' ', nr_context_switches());
+ seq_put_nl(p);
- seq_printf(p, "softirq %llu", (unsigned long long)sum_softirq);
+ seq_puts(p, "btime");
+ seq_put_decimal_ull(p, ' ', (unsigned long)jif);
+ seq_put_nl(p);
+
+ seq_puts(p, "processes");
+ seq_put_decimal_ull(p, ' ', total_forks);
+ seq_put_nl(p);
+
+ seq_puts(p, "process_running");
+ seq_put_decimal_ull(p, ' ', nr_running());
+ seq_put_nl(p);
+
+ seq_puts(p, "process_blocked");
+ seq_put_decimal_ull(p, ' ', nr_iowait());
+ seq_put_nl(p);
+
+ seq_puts(p, "softirq");
+ seq_put_decimal_ull(p, ' ', sum_softirq);
for (i = 0; i < NR_SOFTIRQS; i++)
seq_put_decimal_ull(p, ' ', per_softirq_sums[i]);
- seq_putc(p, '\n');
+ seq_put_nl(p);
return 0;
}
@@ -188,9 +199,45 @@ static const struct file_operations proc_stat_operations = {
.release = single_release,
};
+static int statbin_open(struct inode *inode, struct file *file)
+{
+ unsigned size = 1024 + 160 * num_possible_cpus();
+ char *buf;
+ struct seq_file *m;
+ int res;
+
+ /* each uulong entries requires: 16 bytes */
+ size += 16 * nr_irqs;
+
+ /* don't ask for more than the kmalloc() max size */
+ if (size > KMALLOC_MAX_SIZE)
+ size = KMALLOC_MAX_SIZE;
+ buf = kmalloc(size, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ res = single_open(file, show_stat, NULL);
+ if (!res) {
+ m = file->private_data;
+ m->buf = buf;
+ m->size = ksize(buf);
+ seq_set_binstream(m);
+ } else
+ kfree(buf);
+ return res;
+}
+
+static const struct file_operations proc_statbin_operations = {
+ .open = statbin_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
static int __init proc_stat_init(void)
{
proc_create("stat", 0, NULL, &proc_stat_operations);
+ proc_create("stat.bin", 0, NULL, &proc_statbin_operations);
return 0;
}
module_init(proc_stat_init);
--
1.7.4.1
--
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