Hi Gang, Could you paste an example of outputs before patch VS that after patch? I think that would directly show what the patch does.
thanks, wengang On 05/23/2019 03:40 AM, Gang He wrote:
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. Compared with v2, ocfs2_dlm_init_debug() returns directly with error when creating locking filter debugfs file is failed, since ocfs2_dlm_shutdown_debug() will handle this failure perfectly. Compared with v1, the main change is to add CONFIG_OCFS2_FS_STATS macro definition judgment. Signed-off-by: Gang He <g...@suse.com> Reviewed-by: Joseph Qi <joseph...@linux.alibaba.com> --- fs/ocfs2/dlmglue.c | 36 ++++++++++++++++++++++++++++++++++++ fs/ocfs2/ocfs2.h | 2 ++ 2 files changed, 38 insertions(+) diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c index dccf4136f8c1..fbe4562cf4fe 100644 --- a/fs/ocfs2/dlmglue.c +++ b/fs/ocfs2/dlmglue.c @@ -3006,6 +3006,8 @@ 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; } @@ -3104,11 +3106,33 @@ static int ocfs2_dlm_seq_show(struct seq_file *m, void *v) { int i; char *lvb; + u32 now, last = 0; struct ocfs2_lock_res *lockres = v; + struct ocfs2_dlm_debug *dlm_debug = + ((struct ocfs2_dlm_seq_priv *)m->private)->p_dlm_debug;if (!lockres)return -EINVAL;+ if (dlm_debug->d_filter_secs) {+ now = ktime_to_timespec(ktime_get()).tv_sec; +#ifdef CONFIG_OCFS2_FS_STATS + 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; +#endif + /* + * 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 ((now - last) > dlm_debug->d_filter_secs) + return 0; + } + seq_printf(m, "0x%x\t", OCFS2_DLM_DEBUG_STR_VERSION);if (lockres->l_type == OCFS2_LOCK_TYPE_DENTRY)@@ -3258,6 +3282,17 @@ 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; @@ -3269,6 +3304,7 @@ 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); } } diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h index 8efa022684f4..f4da51099889 100644 --- a/fs/ocfs2/ocfs2.h +++ b/fs/ocfs2/ocfs2.h @@ -237,6 +237,8 @@ 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; };
