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David Howells
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Apr 3, 2009
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,2 +1,2 @@ | ||
| --- | ||
| refs/heads/master: 06b3db1b9bccdc8c2c743122a89745279e5ecc46 | ||
| refs/heads/master: 7394daa8c61dfda4baa687f133748fa0b599b017 |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,109 @@ | ||
| /* FS-Cache latency histogram | ||
| * | ||
| * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved. | ||
| * Written by David Howells (dhowells@redhat.com) | ||
| * | ||
| * This program is free software; you can redistribute it and/or | ||
| * modify it under the terms of the GNU General Public Licence | ||
| * as published by the Free Software Foundation; either version | ||
| * 2 of the Licence, or (at your option) any later version. | ||
| */ | ||
|
|
||
| #define FSCACHE_DEBUG_LEVEL THREAD | ||
| #include <linux/module.h> | ||
| #include <linux/proc_fs.h> | ||
| #include <linux/seq_file.h> | ||
| #include "internal.h" | ||
|
|
||
| atomic_t fscache_obj_instantiate_histogram[HZ]; | ||
| atomic_t fscache_objs_histogram[HZ]; | ||
| atomic_t fscache_ops_histogram[HZ]; | ||
| atomic_t fscache_retrieval_delay_histogram[HZ]; | ||
| atomic_t fscache_retrieval_histogram[HZ]; | ||
|
|
||
| /* | ||
| * display the time-taken histogram | ||
| */ | ||
| static int fscache_histogram_show(struct seq_file *m, void *v) | ||
| { | ||
| unsigned long index; | ||
| unsigned n[5], t; | ||
|
|
||
| switch ((unsigned long) v) { | ||
| case 1: | ||
| seq_puts(m, "JIFS SECS OBJ INST OP RUNS OBJ RUNS " | ||
| " RETRV DLY RETRIEVLS\n"); | ||
| return 0; | ||
| case 2: | ||
| seq_puts(m, "===== ===== ========= ========= =========" | ||
| " ========= =========\n"); | ||
| return 0; | ||
| default: | ||
| index = (unsigned long) v - 3; | ||
| n[0] = atomic_read(&fscache_obj_instantiate_histogram[index]); | ||
| n[1] = atomic_read(&fscache_ops_histogram[index]); | ||
| n[2] = atomic_read(&fscache_objs_histogram[index]); | ||
| n[3] = atomic_read(&fscache_retrieval_delay_histogram[index]); | ||
| n[4] = atomic_read(&fscache_retrieval_histogram[index]); | ||
| if (!(n[0] | n[1] | n[2] | n[3] | n[4])) | ||
| return 0; | ||
|
|
||
| t = (index * 1000) / HZ; | ||
|
|
||
| seq_printf(m, "%4lu 0.%03u %9u %9u %9u %9u %9u\n", | ||
| index, t, n[0], n[1], n[2], n[3], n[4]); | ||
| return 0; | ||
| } | ||
| } | ||
|
|
||
| /* | ||
| * set up the iterator to start reading from the first line | ||
| */ | ||
| static void *fscache_histogram_start(struct seq_file *m, loff_t *_pos) | ||
| { | ||
| if ((unsigned long long)*_pos >= HZ + 2) | ||
| return NULL; | ||
| if (*_pos == 0) | ||
| *_pos = 1; | ||
| return (void *)(unsigned long) *_pos; | ||
| } | ||
|
|
||
| /* | ||
| * move to the next line | ||
| */ | ||
| static void *fscache_histogram_next(struct seq_file *m, void *v, loff_t *pos) | ||
| { | ||
| (*pos)++; | ||
| return (unsigned long long)*pos > HZ + 2 ? | ||
| NULL : (void *)(unsigned long) *pos; | ||
| } | ||
|
|
||
| /* | ||
| * clean up after reading | ||
| */ | ||
| static void fscache_histogram_stop(struct seq_file *m, void *v) | ||
| { | ||
| } | ||
|
|
||
| static const struct seq_operations fscache_histogram_ops = { | ||
| .start = fscache_histogram_start, | ||
| .stop = fscache_histogram_stop, | ||
| .next = fscache_histogram_next, | ||
| .show = fscache_histogram_show, | ||
| }; | ||
|
|
||
| /* | ||
| * open "/proc/fs/fscache/histogram" to provide latency data | ||
| */ | ||
| static int fscache_histogram_open(struct inode *inode, struct file *file) | ||
| { | ||
| return seq_open(file, &fscache_histogram_ops); | ||
| } | ||
|
|
||
| const struct file_operations fscache_histogram_fops = { | ||
| .owner = THIS_MODULE, | ||
| .open = fscache_histogram_open, | ||
| .read = seq_read, | ||
| .llseek = seq_lseek, | ||
| .release = seq_release, | ||
| }; |
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