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ocfs2: add locking filter debugfs file

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Add locking filter debugfs file, which is used to filter lock resources
dump from locking_state debugfs file.  We use d_filter_secs field to
filter lock resources dump, the default d_filter_secs(0) value filters
nothing, otherwise, only dump the last N seconds active lock resources.
This enhancement can avoid dumping lots of old records.  The
d_filter_secs value can be changed via locking_filter file.

[akpm@linux-foundation.org: fix undefined reference to `__udivdi3']
Link: http://lkml.kernel.org/r/20190611015414.27754-2-ghe@suse.com
Signed-off-by: Gang He <ghe@suse.com>
Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>	[build-tested]
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Gang He <ghe@suse.com>
Cc: Jun Piao <piaojun@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Gang He 2019-07-11 20:53:05 -07:00 committed by Linus Torvalds
parent 8a7f5f4c26
commit 8056773ac4
2 changed files with 40 additions and 0 deletions
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38
fs/ocfs2/dlmglue.c
View File

@ -2991,6 +2991,8 @@ struct ocfs2_dlm_debug *ocfs2_new_dlm_debug(void)
kref_init(&dlm_debug->d_refcnt);
INIT_LIST_HEAD(&dlm_debug->d_lockres_tracking);
dlm_debug->d_locking_state = NULL;
dlm_debug->d_locking_filter = NULL;
dlm_debug->d_filter_secs = 0;
out:
return dlm_debug;
}
@ -3090,10 +3092,34 @@ static int ocfs2_dlm_seq_show(struct seq_file *m, void *v)
int i;
char *lvb;
struct ocfs2_lock_res *lockres = v;
#ifdef CONFIG_OCFS2_FS_STATS
u64 now, last;
struct ocfs2_dlm_debug *dlm_debug =
((struct ocfs2_dlm_seq_priv *)m->private)->p_dlm_debug;
#endif
if (!lockres)
return -EINVAL;
#ifdef CONFIG_OCFS2_FS_STATS
if (dlm_debug->d_filter_secs) {
now = ktime_to_us(ktime_get_real());
if (lockres->l_lock_prmode.ls_last >
lockres->l_lock_exmode.ls_last)
last = lockres->l_lock_prmode.ls_last;
else
last = lockres->l_lock_exmode.ls_last;
/*
* Use d_filter_secs field to filter lock resources dump,
* the default d_filter_secs(0) value filters nothing,
* otherwise, only dump the last N seconds active lock
* resources.
*/
if (div_u64(now - last, 1000000) > dlm_debug->d_filter_secs)
return 0;
}
#endif
seq_printf(m, "0x%x\t", OCFS2_DLM_DEBUG_STR_VERSION);
if (lockres->l_type == OCFS2_LOCK_TYPE_DENTRY)
@ -3243,6 +3269,17 @@ static int ocfs2_dlm_init_debug(struct ocfs2_super *osb)
goto out;
}
dlm_debug->d_locking_filter = debugfs_create_u32("locking_filter",
0600,
osb->osb_debug_root,
&dlm_debug->d_filter_secs);
if (!dlm_debug->d_locking_filter) {
ret = -EINVAL;
mlog(ML_ERROR,
"Unable to create locking filter debugfs file.\n");
goto out;
}
ocfs2_get_dlm_debug(dlm_debug);
out:
return ret;
@ -3254,6 +3291,7 @@ static void ocfs2_dlm_shutdown_debug(struct ocfs2_super *osb)
if (dlm_debug) {
debugfs_remove(dlm_debug->d_locking_state);
debugfs_remove(dlm_debug->d_locking_filter);
ocfs2_put_dlm_debug(dlm_debug);
}
}

2
fs/ocfs2/ocfs2.h
View File

@ -223,6 +223,8 @@ struct ocfs2_orphan_scan {
struct ocfs2_dlm_debug {
struct kref d_refcnt;
struct dentry *d_locking_state;
struct dentry *d_locking_filter;
u32 d_filter_secs;
struct list_head d_lockres_tracking;
};