From 9fc3b028b9518bd09fe24219cb2f9c439a1848fc Mon Sep 17 00:00:00 2001 From: "Christopher J. Morrone" Date: Sun, 27 Apr 2014 13:06:49 -0400 Subject: [PATCH] stagaing/lustre: Improve statahead debug messages The statahead debug messages include the pid of the current process in their body. This is both redudant (because all lustre log messages contain the pid), and sometimes downright misleading. For instance the messages would say something like "stopping statahead thread 3446". One would probably think that 3446 is the pid of the process that is being stopped, but in fact it was the pid of the caller issuing the stop signal. We remove all superfluous pids from the messages. Next we have the ll_statahead_thread() and the ll_agl_thread() record their respective pids in their respective ptlrpc_thread structures. This allows to print the pid of the thread that we are trying to stop (which is actually useful info) from other threads, such as those calling ll_stop_statahead(). Signed-off-by: Christopher J. Morrone Reviewed-on: http://review.whamcloud.com/9360 Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-4624 Reviewed-by: Fan Yong Reviewed-by: Lai Siyao Signed-off-by: Oleg Drokin Signed-off-by: Greg Kroah-Hartman --- .../staging/lustre/lustre/llite/statahead.c | 38 ++++++++++--------- 1 file changed, 20 insertions(+), 18 deletions(-) diff --git a/drivers/staging/lustre/lustre/llite/statahead.c b/drivers/staging/lustre/lustre/llite/statahead.c index 74d95b04d235..51c532756a7c 100644 --- a/drivers/staging/lustre/lustre/llite/statahead.c +++ b/drivers/staging/lustre/lustre/llite/statahead.c @@ -958,8 +958,9 @@ static int ll_agl_thread(void *arg) struct ptlrpc_thread *thread = &sai->sai_agl_thread; struct l_wait_info lwi = { 0 }; - CDEBUG(D_READA, "agl thread started: [pid %d] [parent %.*s]\n", - current_pid(), parent->d_name.len, parent->d_name.name); + thread->t_pid = current_pid(); + CDEBUG(D_READA, "agl thread started: sai %p, parent %.*s\n", + sai, parent->d_name.len, parent->d_name.name); atomic_inc(&sbi->ll_agl_total); spin_lock(&plli->lli_agl_lock); @@ -1008,8 +1009,8 @@ static int ll_agl_thread(void *arg) spin_unlock(&plli->lli_agl_lock); wake_up(&thread->t_ctl_waitq); ll_sai_put(sai); - CDEBUG(D_READA, "agl thread stopped: [pid %d] [parent %.*s]\n", - current_pid(), parent->d_name.len, parent->d_name.name); + CDEBUG(D_READA, "agl thread stopped: sai %p, parent %.*s\n", + sai, parent->d_name.len, parent->d_name.name); return 0; } @@ -1020,8 +1021,8 @@ static void ll_start_agl(struct dentry *parent, struct ll_statahead_info *sai) struct ll_inode_info *plli; struct task_struct *task; - CDEBUG(D_READA, "start agl thread: [pid %d] [parent %.*s]\n", - current_pid(), parent->d_name.len, parent->d_name.name); + CDEBUG(D_READA, "start agl thread: sai %p, parent %.*s\n", + sai, parent->d_name.len, parent->d_name.name); plli = ll_i2info(parent->d_inode); task = kthread_run(ll_agl_thread, parent, @@ -1054,8 +1055,9 @@ static int ll_statahead_thread(void *arg) struct ll_dir_chain chain; struct l_wait_info lwi = { 0 }; - CDEBUG(D_READA, "statahead thread started: [pid %d] [parent %.*s]\n", - current_pid(), parent->d_name.len, parent->d_name.name); + thread->t_pid = current_pid(); + CDEBUG(D_READA, "statahead thread starting: sai %p, parent %.*s\n", + sai, parent->d_name.len, parent->d_name.name); if (sbi->ll_flags & LL_SBI_AGL_ENABLED) ll_start_agl(parent, sai); @@ -1247,8 +1249,8 @@ out: spin_unlock(&plli->lli_agl_lock); wake_up(&agl_thread->t_ctl_waitq); - CDEBUG(D_READA, "stop agl thread: [pid %d]\n", - current_pid()); + CDEBUG(D_READA, "stop agl thread: sai %p pid %u\n", + sai, (unsigned int)agl_thread->t_pid); l_wait_event(agl_thread->t_ctl_waitq, thread_is_stopped(agl_thread), &lwi); @@ -1274,8 +1276,8 @@ out: wake_up(&thread->t_ctl_waitq); ll_sai_put(sai); dput(parent); - CDEBUG(D_READA, "statahead thread stopped: [pid %d] [parent %.*s]\n", - current_pid(), parent->d_name.len, parent->d_name.name); + CDEBUG(D_READA, "statahead thread stopped: sai %p, parent %.*s\n", + sai, parent->d_name.len, parent->d_name.name); return rc; } @@ -1306,8 +1308,8 @@ void ll_stop_statahead(struct inode *dir, void *key) spin_unlock(&lli->lli_sa_lock); wake_up(&thread->t_ctl_waitq); - CDEBUG(D_READA, "stop statahead thread: [pid %d]\n", - current_pid()); + CDEBUG(D_READA, "stop statahead thread: sai %p pid %u\n", + lli->lli_sai, (unsigned int)thread->t_pid); l_wait_event(thread->t_ctl_waitq, thread_is_stopped(thread), &lwi); @@ -1481,10 +1483,10 @@ ll_sai_unplug(struct ll_statahead_info *sai, struct ll_sa_entry *entry) CDEBUG(D_READA, "Statahead for dir "DFID" hit " "ratio too low: hit/miss "LPU64"/"LPU64 ", sent/replied "LPU64"/"LPU64", stopping " - "statahead thread: pid %d\n", + "statahead thread\n", PFID(&lli->lli_fid), sai->sai_hit, sai->sai_miss, sai->sai_sent, - sai->sai_replied, current_pid()); + sai->sai_replied); spin_lock(&lli->lli_sa_lock); if (!thread_is_stopped(thread)) thread_set_flags(thread, SVC_STOPPING); @@ -1663,8 +1665,8 @@ int do_statahead_enter(struct inode *dir, struct dentry **dentryp, GOTO(out, rc = -EAGAIN); } - CDEBUG(D_READA, "start statahead thread: [pid %d] [parent %.*s]\n", - current_pid(), parent->d_name.len, parent->d_name.name); + CDEBUG(D_READA, "start statahead thread: sai %p, parent %.*s\n", + sai, parent->d_name.len, parent->d_name.name); /* The sai buffer already has one reference taken at allocation time, * but as soon as we expose the sai by attaching it to the lli that -- 2.20.1