From mboxrd@z Thu Jan 1 00:00:00 1970 From: Joel Becker Date: Thu Feb 28 16:53:06 2008 Subject: [Ocfs2-devel] [PATCH 12/18] ocfs2_dlm: Dumps the purgelist into a debugfs file In-Reply-To: <1203970862-8790-13-git-send-email-sunil.mushran@oracle.com> References: <1203970862-8790-1-git-send-email-sunil.mushran@oracle.com> <1203970862-8790-13-git-send-email-sunil.mushran@oracle.com> Message-ID: <20080229005220.GN23975@mail.oracle.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: ocfs2-devel@oss.oracle.com On Mon, Feb 25, 2008 at 12:20:56PM -0800, Sunil Mushran wrote: > This patch dumps all the lockres' on the purgelist it can fit in one page > into a debugfs file. Useful for debugging. > > Signed-off-by: Sunil Mushran Looks good modulo DEBUG_FS. Joel > --- > fs/ocfs2/dlm/dlmdebug.c | 71 +++++++++++++++++++++++++++++++++++++++++++++++ > fs/ocfs2/dlm/dlmdebug.h | 1 + > 2 files changed, 72 insertions(+), 0 deletions(-) > > diff --git a/fs/ocfs2/dlm/dlmdebug.c b/fs/ocfs2/dlm/dlmdebug.c > index 158b2e5..ffdc976 100644 > --- a/fs/ocfs2/dlm/dlmdebug.c > +++ b/fs/ocfs2/dlm/dlmdebug.c > @@ -707,6 +707,7 @@ EXPORT_SYMBOL_GPL(dlm_errname); > #define DLM_DEBUGFS_DLM_STATE "dlm_state" > #define DLM_DEBUGFS_LOCKING_STATE "locking_state" > #define DLM_DEBUGFS_MLE_STATE "mle_state" > +#define DLM_DEBUGFS_PURGE_LIST "purge_list" > > /* NOTE: This function converts a lockname into a string. It uses knowledge > * of the format of the lockname that should be outside the purview of the dlm. > @@ -828,6 +829,63 @@ static int debug_buffer_release(struct inode *inode, struct file *file) > } > /* end - util funcs */ > > +/* begin - purge list funcs */ > +static int debug_purgelist_print(struct dlm_ctxt *dlm, struct debug_buffer *db) > +{ > + struct dlm_lock_resource *res; > + int out = 0; > + unsigned long total = 0; > + > + out += snprintf(db->buf + out, db->len - out, > + "Dumping Purgelist for Domain: %s\n", dlm->name); > + > + spin_lock(&dlm->spinlock); > + list_for_each_entry(res, &dlm->purge_list, purge) { > + ++total; > + if (db->len - out < 100) > + continue; > + spin_lock(&res->spinlock); > + out += stringify_lockname(res->lockname.name, > + res->lockname.len, > + db->buf + out, db->len - out); > + out += snprintf(db->buf + out, db->len - out, "\t%ld\n", > + (jiffies - res->last_used)/HZ); > + spin_unlock(&res->spinlock); > + } > + spin_unlock(&dlm->spinlock); > + > + out += snprintf(db->buf + out, db->len - out, > + "Total on list: %ld\n", total); > + > + return out; > +} > + > +static int debug_purgelist_open(struct inode *inode, struct file *file) > +{ > + struct dlm_ctxt *dlm = inode->i_private; > + struct debug_buffer *db; > + > + db = debug_buffer_allocate(); > + if (!db) > + goto bail; > + > + db->len = debug_purgelist_print(dlm, db); > + > + file->private_data = db; > + > + return 0; > +bail: > + return -ENOMEM; > +} > + > +static struct file_operations debug_purgelist_fops = { > + .open = debug_purgelist_open, > + .release = debug_buffer_release, > + .read = debug_buffer_read, > + .llseek = debug_buffer_llseek, > +}; > +/* end - purge list funcs */ > + > /* begin - debug mle funcs */ > static int dump_mle(struct dlm_master_list_entry *mle, char *buf, int len) > { > @@ -1339,6 +1397,17 @@ int dlm_debug_init(struct dlm_ctxt *dlm) > goto bail; > } > > + /* for dumping lockres on the purge list */ > + dc->debug_purgelist_dentry = > + debugfs_create_file(DLM_DEBUGFS_PURGE_LIST, > + S_IFREG|S_IRUSR, > + dlm->dlm_debugfs_subroot, > + dlm, &debug_purgelist_fops); > + if (!dc->debug_purgelist_dentry) { > + mlog_errno(-ENOMEM); > + goto bail; > + } > + > dlm_debug_get(dc); > return 0; > > @@ -1352,6 +1421,8 @@ void dlm_debug_shutdown(struct dlm_ctxt *dlm) > struct dlm_debug_ctxt *dc = dlm->dlm_debug_ctxt; > > if (dc) { > + if (dc->debug_purgelist_dentry) > + debugfs_remove(dc->debug_purgelist_dentry); > if (dc->debug_mle_dentry) > debugfs_remove(dc->debug_mle_dentry); > if (dc->debug_lockres_dentry) > diff --git a/fs/ocfs2/dlm/dlmdebug.h b/fs/ocfs2/dlm/dlmdebug.h > index c6b240f..ca7bc32 100644 > --- a/fs/ocfs2/dlm/dlmdebug.h > +++ b/fs/ocfs2/dlm/dlmdebug.h > @@ -30,6 +30,7 @@ struct dlm_debug_ctxt { > struct dentry *debug_state_dentry; > struct dentry *debug_lockres_dentry; > struct dentry *debug_mle_dentry; > + struct dentry *debug_purgelist_dentry; > }; > > struct debug_buffer > -- > 1.5.2.5 > > > _______________________________________________ > Ocfs2-devel mailing list > Ocfs2-devel@oss.oracle.com > http://oss.oracle.com/mailman/listinfo/ocfs2-devel -- "The trouble with being punctual is that nobody's there to appreciate it." - Franklin P. Jones Joel Becker Principal Software Developer Oracle E-mail: joel.becker@oracle.com Phone: (650) 506-8127