aboutsummaryrefslogtreecommitdiffstats
path: root/fs/xfs/support
diff options
context:
space:
mode:
authorChristoph Hellwig <hch@infradead.org>2009-12-14 18:14:59 -0500
committerAlex Elder <aelder@sgi.com>2009-12-15 00:08:16 -0500
commit0b1b213fcf3a8486ada99a2bab84ab8c6f51b264 (patch)
tree661fd8da7487231224c77b95c33986cb7d7b41ef /fs/xfs/support
parent6ef3554422e2c7e7aa424ba63737da498881dff4 (diff)
xfs: event tracing support
Convert the old xfs tracing support that could only be used with the out of tree kdb and xfsidbg patches to use the generic event tracer. To use it make sure CONFIG_EVENT_TRACING is enabled and then enable all xfs trace channels by: echo 1 > /sys/kernel/debug/tracing/events/xfs/enable or alternatively enable single events by just doing the same in one event subdirectory, e.g. echo 1 > /sys/kernel/debug/tracing/events/xfs/xfs_ihold/enable or set more complex filters, etc. In Documentation/trace/events.txt all this is desctribed in more detail. To reads the events do a cat /sys/kernel/debug/tracing/trace Compared to the last posting this patch converts the tracing mostly to the one tracepoint per callsite model that other users of the new tracing facility also employ. This allows a very fine-grained control of the tracing, a cleaner output of the traces and also enables the perf tool to use each tracepoint as a virtual performance counter, allowing us to e.g. count how often certain workloads git various spots in XFS. Take a look at http://lwn.net/Articles/346470/ for some examples. Also the btree tracing isn't included at all yet, as it will require additional core tracing features not in mainline yet, I plan to deliver it later. And the really nice thing about this patch is that it actually removes many lines of code while adding this nice functionality: fs/xfs/Makefile | 8 fs/xfs/linux-2.6/xfs_acl.c | 1 fs/xfs/linux-2.6/xfs_aops.c | 52 - fs/xfs/linux-2.6/xfs_aops.h | 2 fs/xfs/linux-2.6/xfs_buf.c | 117 +-- fs/xfs/linux-2.6/xfs_buf.h | 33 fs/xfs/linux-2.6/xfs_fs_subr.c | 3 fs/xfs/linux-2.6/xfs_ioctl.c | 1 fs/xfs/linux-2.6/xfs_ioctl32.c | 1 fs/xfs/linux-2.6/xfs_iops.c | 1 fs/xfs/linux-2.6/xfs_linux.h | 1 fs/xfs/linux-2.6/xfs_lrw.c | 87 -- fs/xfs/linux-2.6/xfs_lrw.h | 45 - fs/xfs/linux-2.6/xfs_super.c | 104 --- fs/xfs/linux-2.6/xfs_super.h | 7 fs/xfs/linux-2.6/xfs_sync.c | 1 fs/xfs/linux-2.6/xfs_trace.c | 75 ++ fs/xfs/linux-2.6/xfs_trace.h | 1369 +++++++++++++++++++++++++++++++++++++++++ fs/xfs/linux-2.6/xfs_vnode.h | 4 fs/xfs/quota/xfs_dquot.c | 110 --- fs/xfs/quota/xfs_dquot.h | 21 fs/xfs/quota/xfs_qm.c | 40 - fs/xfs/quota/xfs_qm_syscalls.c | 4 fs/xfs/support/ktrace.c | 323 --------- fs/xfs/support/ktrace.h | 85 -- fs/xfs/xfs.h | 16 fs/xfs/xfs_ag.h | 14 fs/xfs/xfs_alloc.c | 230 +----- fs/xfs/xfs_alloc.h | 27 fs/xfs/xfs_alloc_btree.c | 1 fs/xfs/xfs_attr.c | 107 --- fs/xfs/xfs_attr.h | 10 fs/xfs/xfs_attr_leaf.c | 14 fs/xfs/xfs_attr_sf.h | 40 - fs/xfs/xfs_bmap.c | 507 +++------------ fs/xfs/xfs_bmap.h | 49 - fs/xfs/xfs_bmap_btree.c | 6 fs/xfs/xfs_btree.c | 5 fs/xfs/xfs_btree_trace.h | 17 fs/xfs/xfs_buf_item.c | 87 -- fs/xfs/xfs_buf_item.h | 20 fs/xfs/xfs_da_btree.c | 3 fs/xfs/xfs_da_btree.h | 7 fs/xfs/xfs_dfrag.c | 2 fs/xfs/xfs_dir2.c | 8 fs/xfs/xfs_dir2_block.c | 20 fs/xfs/xfs_dir2_leaf.c | 21 fs/xfs/xfs_dir2_node.c | 27 fs/xfs/xfs_dir2_sf.c | 26 fs/xfs/xfs_dir2_trace.c | 216 ------ fs/xfs/xfs_dir2_trace.h | 72 -- fs/xfs/xfs_filestream.c | 8 fs/xfs/xfs_fsops.c | 2 fs/xfs/xfs_iget.c | 111 --- fs/xfs/xfs_inode.c | 67 -- fs/xfs/xfs_inode.h | 76 -- fs/xfs/xfs_inode_item.c | 5 fs/xfs/xfs_iomap.c | 85 -- fs/xfs/xfs_iomap.h | 8 fs/xfs/xfs_log.c | 181 +---- fs/xfs/xfs_log_priv.h | 20 fs/xfs/xfs_log_recover.c | 1 fs/xfs/xfs_mount.c | 2 fs/xfs/xfs_quota.h | 8 fs/xfs/xfs_rename.c | 1 fs/xfs/xfs_rtalloc.c | 1 fs/xfs/xfs_rw.c | 3 fs/xfs/xfs_trans.h | 47 + fs/xfs/xfs_trans_buf.c | 62 - fs/xfs/xfs_vnodeops.c | 8 70 files changed, 2151 insertions(+), 2592 deletions(-) Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Alex Elder <aelder@sgi.com>
Diffstat (limited to 'fs/xfs/support')
-rw-r--r--fs/xfs/support/ktrace.c323
-rw-r--r--fs/xfs/support/ktrace.h85
2 files changed, 0 insertions, 408 deletions
diff --git a/fs/xfs/support/ktrace.c b/fs/xfs/support/ktrace.c
deleted file mode 100644
index 2d494c26717f..000000000000
--- a/fs/xfs/support/ktrace.c
+++ /dev/null
@@ -1,323 +0,0 @@
1/*
2 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18#include <xfs.h>
19
20static kmem_zone_t *ktrace_hdr_zone;
21static kmem_zone_t *ktrace_ent_zone;
22static int ktrace_zentries;
23
24void __init
25ktrace_init(int zentries)
26{
27 ktrace_zentries = roundup_pow_of_two(zentries);
28
29 ktrace_hdr_zone = kmem_zone_init(sizeof(ktrace_t),
30 "ktrace_hdr");
31 ASSERT(ktrace_hdr_zone);
32
33 ktrace_ent_zone = kmem_zone_init(ktrace_zentries
34 * sizeof(ktrace_entry_t),
35 "ktrace_ent");
36 ASSERT(ktrace_ent_zone);
37}
38
39void __exit
40ktrace_uninit(void)
41{
42 kmem_zone_destroy(ktrace_hdr_zone);
43 kmem_zone_destroy(ktrace_ent_zone);
44}
45
46/*
47 * ktrace_alloc()
48 *
49 * Allocate a ktrace header and enough buffering for the given
50 * number of entries. Round the number of entries up to a
51 * power of 2 so we can do fast masking to get the index from
52 * the atomic index counter.
53 */
54ktrace_t *
55ktrace_alloc(int nentries, unsigned int __nocast sleep)
56{
57 ktrace_t *ktp;
58 ktrace_entry_t *ktep;
59 int entries;
60
61 ktp = (ktrace_t*)kmem_zone_alloc(ktrace_hdr_zone, sleep);
62
63 if (ktp == (ktrace_t*)NULL) {
64 /*
65 * KM_SLEEP callers don't expect failure.
66 */
67 if (sleep & KM_SLEEP)
68 panic("ktrace_alloc: NULL memory on KM_SLEEP request!");
69
70 return NULL;
71 }
72
73 /*
74 * Special treatment for buffers with the ktrace_zentries entries
75 */
76 entries = roundup_pow_of_two(nentries);
77 if (entries == ktrace_zentries) {
78 ktep = (ktrace_entry_t*)kmem_zone_zalloc(ktrace_ent_zone,
79 sleep);
80 } else {
81 ktep = (ktrace_entry_t*)kmem_zalloc((entries * sizeof(*ktep)),
82 sleep | KM_LARGE);
83 }
84
85 if (ktep == NULL) {
86 /*
87 * KM_SLEEP callers don't expect failure.
88 */
89 if (sleep & KM_SLEEP)
90 panic("ktrace_alloc: NULL memory on KM_SLEEP request!");
91
92 kmem_free(ktp);
93
94 return NULL;
95 }
96
97 ktp->kt_entries = ktep;
98 ktp->kt_nentries = entries;
99 ASSERT(is_power_of_2(entries));
100 ktp->kt_index_mask = entries - 1;
101 atomic_set(&ktp->kt_index, 0);
102 ktp->kt_rollover = 0;
103 return ktp;
104}
105
106
107/*
108 * ktrace_free()
109 *
110 * Free up the ktrace header and buffer. It is up to the caller
111 * to ensure that no-one is referencing it.
112 */
113void
114ktrace_free(ktrace_t *ktp)
115{
116 if (ktp == (ktrace_t *)NULL)
117 return;
118
119 /*
120 * Special treatment for the Vnode trace buffer.
121 */
122 if (ktp->kt_nentries == ktrace_zentries)
123 kmem_zone_free(ktrace_ent_zone, ktp->kt_entries);
124 else
125 kmem_free(ktp->kt_entries);
126
127 kmem_zone_free(ktrace_hdr_zone, ktp);
128}
129
130
131/*
132 * Enter the given values into the "next" entry in the trace buffer.
133 * kt_index is always the index of the next entry to be filled.
134 */
135void
136ktrace_enter(
137 ktrace_t *ktp,
138 void *val0,
139 void *val1,
140 void *val2,
141 void *val3,
142 void *val4,
143 void *val5,
144 void *val6,
145 void *val7,
146 void *val8,
147 void *val9,
148 void *val10,
149 void *val11,
150 void *val12,
151 void *val13,
152 void *val14,
153 void *val15)
154{
155 int index;
156 ktrace_entry_t *ktep;
157
158 ASSERT(ktp != NULL);
159
160 /*
161 * Grab an entry by pushing the index up to the next one.
162 */
163 index = atomic_add_return(1, &ktp->kt_index);
164 index = (index - 1) & ktp->kt_index_mask;
165 if (!ktp->kt_rollover && index == ktp->kt_nentries - 1)
166 ktp->kt_rollover = 1;
167
168 ASSERT((index >= 0) && (index < ktp->kt_nentries));
169
170 ktep = &(ktp->kt_entries[index]);
171
172 ktep->val[0] = val0;
173 ktep->val[1] = val1;
174 ktep->val[2] = val2;
175 ktep->val[3] = val3;
176 ktep->val[4] = val4;
177 ktep->val[5] = val5;
178 ktep->val[6] = val6;
179 ktep->val[7] = val7;
180 ktep->val[8] = val8;
181 ktep->val[9] = val9;
182 ktep->val[10] = val10;
183 ktep->val[11] = val11;
184 ktep->val[12] = val12;
185 ktep->val[13] = val13;
186 ktep->val[14] = val14;
187 ktep->val[15] = val15;
188}
189
190/*
191 * Return the number of entries in the trace buffer.
192 */
193int
194ktrace_nentries(
195 ktrace_t *ktp)
196{
197 int index;
198 if (ktp == NULL)
199 return 0;
200
201 index = atomic_read(&ktp->kt_index) & ktp->kt_index_mask;
202 return (ktp->kt_rollover ? ktp->kt_nentries : index);
203}
204
205/*
206 * ktrace_first()
207 *
208 * This is used to find the start of the trace buffer.
209 * In conjunction with ktrace_next() it can be used to
210 * iterate through the entire trace buffer. This code does
211 * not do any locking because it is assumed that it is called
212 * from the debugger.
213 *
214 * The caller must pass in a pointer to a ktrace_snap
215 * structure in which we will keep some state used to
216 * iterate through the buffer. This state must not touched
217 * by any code outside of this module.
218 */
219ktrace_entry_t *
220ktrace_first(ktrace_t *ktp, ktrace_snap_t *ktsp)
221{
222 ktrace_entry_t *ktep;
223 int index;
224 int nentries;
225
226 if (ktp->kt_rollover)
227 index = atomic_read(&ktp->kt_index) & ktp->kt_index_mask;
228 else
229 index = 0;
230
231 ktsp->ks_start = index;
232 ktep = &(ktp->kt_entries[index]);
233
234 nentries = ktrace_nentries(ktp);
235 index++;
236 if (index < nentries) {
237 ktsp->ks_index = index;
238 } else {
239 ktsp->ks_index = 0;
240 if (index > nentries)
241 ktep = NULL;
242 }
243 return ktep;
244}
245
246/*
247 * ktrace_next()
248 *
249 * This is used to iterate through the entries of the given
250 * trace buffer. The caller must pass in the ktrace_snap_t
251 * structure initialized by ktrace_first(). The return value
252 * will be either a pointer to the next ktrace_entry or NULL
253 * if all of the entries have been traversed.
254 */
255ktrace_entry_t *
256ktrace_next(
257 ktrace_t *ktp,
258 ktrace_snap_t *ktsp)
259{
260 int index;
261 ktrace_entry_t *ktep;
262
263 index = ktsp->ks_index;
264 if (index == ktsp->ks_start) {
265 ktep = NULL;
266 } else {
267 ktep = &ktp->kt_entries[index];
268 }
269
270 index++;
271 if (index == ktrace_nentries(ktp)) {
272 ktsp->ks_index = 0;
273 } else {
274 ktsp->ks_index = index;
275 }
276
277 return ktep;
278}
279
280/*
281 * ktrace_skip()
282 *
283 * Skip the next "count" entries and return the entry after that.
284 * Return NULL if this causes us to iterate past the beginning again.
285 */
286ktrace_entry_t *
287ktrace_skip(
288 ktrace_t *ktp,
289 int count,
290 ktrace_snap_t *ktsp)
291{
292 int index;
293 int new_index;
294 ktrace_entry_t *ktep;
295 int nentries = ktrace_nentries(ktp);
296
297 index = ktsp->ks_index;
298 new_index = index + count;
299 while (new_index >= nentries) {
300 new_index -= nentries;
301 }
302 if (index == ktsp->ks_start) {
303 /*
304 * We've iterated around to the start, so we're done.
305 */
306 ktep = NULL;
307 } else if ((new_index < index) && (index < ktsp->ks_index)) {
308 /*
309 * We've skipped past the start again, so we're done.
310 */
311 ktep = NULL;
312 ktsp->ks_index = ktsp->ks_start;
313 } else {
314 ktep = &(ktp->kt_entries[new_index]);
315 new_index++;
316 if (new_index == nentries) {
317 ktsp->ks_index = 0;
318 } else {
319 ktsp->ks_index = new_index;
320 }
321 }
322 return ktep;
323}
diff --git a/fs/xfs/support/ktrace.h b/fs/xfs/support/ktrace.h
deleted file mode 100644
index 741d6947ca60..000000000000
--- a/fs/xfs/support/ktrace.h
+++ /dev/null
@@ -1,85 +0,0 @@
1/*
2 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18#ifndef __XFS_SUPPORT_KTRACE_H__
19#define __XFS_SUPPORT_KTRACE_H__
20
21/*
22 * Trace buffer entry structure.
23 */
24typedef struct ktrace_entry {
25 void *val[16];
26} ktrace_entry_t;
27
28/*
29 * Trace buffer header structure.
30 */
31typedef struct ktrace {
32 int kt_nentries; /* number of entries in trace buf */
33 atomic_t kt_index; /* current index in entries */
34 unsigned int kt_index_mask;
35 int kt_rollover;
36 ktrace_entry_t *kt_entries; /* buffer of entries */
37} ktrace_t;
38
39/*
40 * Trace buffer snapshot structure.
41 */
42typedef struct ktrace_snap {
43 int ks_start; /* kt_index at time of snap */
44 int ks_index; /* current index */
45} ktrace_snap_t;
46
47
48#ifdef CONFIG_XFS_TRACE
49
50extern void ktrace_init(int zentries);
51extern void ktrace_uninit(void);
52
53extern ktrace_t *ktrace_alloc(int, unsigned int __nocast);
54extern void ktrace_free(ktrace_t *);
55
56extern void ktrace_enter(
57 ktrace_t *,
58 void *,
59 void *,
60 void *,
61 void *,
62 void *,
63 void *,
64 void *,
65 void *,
66 void *,
67 void *,
68 void *,
69 void *,
70 void *,
71 void *,
72 void *,
73 void *);
74
75extern ktrace_entry_t *ktrace_first(ktrace_t *, ktrace_snap_t *);
76extern int ktrace_nentries(ktrace_t *);
77extern ktrace_entry_t *ktrace_next(ktrace_t *, ktrace_snap_t *);
78extern ktrace_entry_t *ktrace_skip(ktrace_t *, int, ktrace_snap_t *);
79
80#else
81#define ktrace_init(x) do { } while (0)
82#define ktrace_uninit() do { } while (0)
83#endif /* CONFIG_XFS_TRACE */
84
85#endif /* __XFS_SUPPORT_KTRACE_H__ */
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-20 17:04:07 -0500