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authorGang He <ghe@suse.com>2019-07-12 06:53:05 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2019-07-12 21:05:41 +0300
commit8056773ac4b42f36bae6406030218a5f12749c64 (patch)
tree1b1056870238577f5c65334b21f774edf8424494 /fs/ocfs2/dlmglue.c
parent8a7f5f4c26dd4e969b5f3b30d06c54dc6a520eda (diff)
downloadlinux-8056773ac4b42f36bae6406030218a5f12749c64.tar.xz
ocfs2: add locking filter debugfs file
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>
Diffstat (limited to 'fs/ocfs2/dlmglue.c')
-rw-r--r--fs/ocfs2/dlmglue.c38
1 files changed, 38 insertions, 0 deletions
diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c
index 5f696be267e7..4089daba4c6f 100644
--- a/fs/ocfs2/dlmglue.c
+++ b/fs/ocfs2/dlmglue.c
@@ -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);
}
}