VisionFive2 Linux kernel

b4d0d230ccfb5 (Thomas Gleixner   2019-05-20 19:08:01 +0200  1) // SPDX-License-Identifier: GPL-2.0-or-later
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100  2) /* FS-Cache latency histogram
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100  3)  *
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100  4)  * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100  5)  * Written by David Howells (dhowells@redhat.com)
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100  6)  */
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100  7) 
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100  8) #define FSCACHE_DEBUG_LEVEL THREAD
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100  9) #include <linux/module.h>
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 10) #include <linux/proc_fs.h>
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 11) #include <linux/seq_file.h>
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 12) #include "internal.h"
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 13) 
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 14) atomic_t fscache_obj_instantiate_histogram[HZ];
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 15) atomic_t fscache_objs_histogram[HZ];
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 16) atomic_t fscache_ops_histogram[HZ];
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 17) atomic_t fscache_retrieval_delay_histogram[HZ];
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 18) atomic_t fscache_retrieval_histogram[HZ];
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 19) 
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 20) /*
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 21)  * display the time-taken histogram
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 22)  */
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 23) static int fscache_histogram_show(struct seq_file *m, void *v)
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 24) {
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 25) 	unsigned long index;
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 26) 	unsigned n[5], t;
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 27) 
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 28) 	switch ((unsigned long) v) {
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 29) 	case 1:
3185a88ce3749 (Fabian Frederick  2014-06-04 16:05:39 -0700 30) 		seq_puts(m, "JIFS  SECS  OBJ INST  OP RUNS   OBJ RUNS  RETRV DLY RETRIEVLS\n");
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 31) 		return 0;
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 32) 	case 2:
3185a88ce3749 (Fabian Frederick  2014-06-04 16:05:39 -0700 33) 		seq_puts(m, "===== ===== ========= ========= ========= ========= =========\n");
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 34) 		return 0;
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 35) 	default:
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 36) 		index = (unsigned long) v - 3;
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 37) 		n[0] = atomic_read(&fscache_obj_instantiate_histogram[index]);
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 38) 		n[1] = atomic_read(&fscache_ops_histogram[index]);
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 39) 		n[2] = atomic_read(&fscache_objs_histogram[index]);
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 40) 		n[3] = atomic_read(&fscache_retrieval_delay_histogram[index]);
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 41) 		n[4] = atomic_read(&fscache_retrieval_histogram[index]);
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 42) 		if (!(n[0] | n[1] | n[2] | n[3] | n[4]))
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 43) 			return 0;
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 44) 
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 45) 		t = (index * 1000) / HZ;
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 46) 
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 47) 		seq_printf(m, "%4lu  0.%03u %9u %9u %9u %9u %9u\n",
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 48) 			   index, t, n[0], n[1], n[2], n[3], n[4]);
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 49) 		return 0;
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 50) 	}
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 51) }
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 52) 
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 53) /*
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 54)  * set up the iterator to start reading from the first line
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 55)  */
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 56) static void *fscache_histogram_start(struct seq_file *m, loff_t *_pos)
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 57) {
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 58) 	if ((unsigned long long)*_pos >= HZ + 2)
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 59) 		return NULL;
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 60) 	if (*_pos == 0)
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 61) 		*_pos = 1;
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 62) 	return (void *)(unsigned long) *_pos;
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 63) }
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 64) 
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 65) /*
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 66)  * move to the next line
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 67)  */
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 68) static void *fscache_histogram_next(struct seq_file *m, void *v, loff_t *pos)
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 69) {
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 70) 	(*pos)++;
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 71) 	return (unsigned long long)*pos > HZ + 2 ?
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 72) 		NULL : (void *)(unsigned long) *pos;
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 73) }
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 74) 
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 75) /*
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 76)  * clean up after reading
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 77)  */
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 78) static void fscache_histogram_stop(struct seq_file *m, void *v)
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 79) {
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 80) }
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 81) 
fddda2b7b5211 (Christoph Hellwig 2018-04-13 19:44:18 +0200 82) const struct seq_operations fscache_histogram_ops = {
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 83) 	.start		= fscache_histogram_start,
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 84) 	.stop		= fscache_histogram_stop,
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 85) 	.next		= fscache_histogram_next,
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 86) 	.show		= fscache_histogram_show,
7394daa8c61df (David Howells     2009-04-03 16:42:37 +0100 87) };