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Fri, 24 May 2019 19:52:44 +0000 Subject: Re: [Ocfs2-devel] [PATCH V3 2/2] ocfs2: add locking filter debugfs file To: Gang He Cc: jlbec@evilplan.org, mark@fasheh.com, jiangqi903@gmail.com, ocfs2-devel@oss.oracle.com, linux-kernel@vger.kernel.org References: <20190523104047.14794-1-ghe@suse.com> <20190523104047.14794-2-ghe@suse.com> <5CE753AB020000F900067E5D@prv1-mh.provo.novell.com> From: Wengang Wang Organization: Oracle Corporation Message-ID: Date: Fri, 24 May 2019 12:52:41 -0700 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <5CE753AB020000F900067E5D@prv1-mh.provo.novell.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9267 signatures=668687 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1905240129 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Gang, OK, I was thinking you are dumping the new last access time field too. thanks, wengang On 2019/5/23 19:15, Gang He wrote: > Hello Wengang, > > This patch is used to add a filter attribute(the default value is 0), the kernel module can use this attribute value to filter the lock resources dumping. > By default(the value is 0), the kernel module does not filter any lock resources dumping, the behavior is like before. > If the user set a value(N) of this attribute, the kernel module will only dump the latest N seconds active lock resources, this will avoid dumping lots of inactive lock resources. > > Thanks > Gang > >>>> On 2019/5/24 at 0:43, in message > , Wengang > wrote: >> 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 >>> Reviewed-by: Joseph Qi >>> --- >>> 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; >>> }; >>>