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Subject[PATCH 18/58] staging: lustre: llite: do post work for statahead in readdir case
Date
From: wang di <di.wang@intel.com>

Increase the post-work for the statahead thread in the readdir
case since it can become very busy.

Signed-off-by: wang di <di.wang@intel.com>
Reviewed-on: http://review.whamcloud.com/10761
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-4906
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: James Simmons <jsimmons@infradead.org>
---
.../staging/lustre/lustre/llite/llite_internal.h | 3 ++-
drivers/staging/lustre/lustre/llite/statahead.c | 7 +++++++
2 files changed, 9 insertions(+), 1 deletions(-)

diff --git a/drivers/staging/lustre/lustre/llite/llite_internal.h b/drivers/staging/lustre/lustre/llite/llite_internal.h
index e650aeb..dc15957 100644
--- a/drivers/staging/lustre/lustre/llite/llite_internal.h
+++ b/drivers/staging/lustre/lustre/llite/llite_internal.h
@@ -997,7 +997,8 @@ struct ll_statahead_info {
unsigned int sai_ls_all:1, /* "ls -al", do stat-ahead for
* hidden entries
*/
- sai_agl_valid:1;/* AGL is valid for the dir */
+ sai_agl_valid:1,/* AGL is valid for the dir */
+ sai_in_readpage:1;/* statahead is in readdir() */
wait_queue_head_t sai_waitq; /* stat-ahead wait queue */
struct ptlrpc_thread sai_thread; /* stat-ahead thread */
struct ptlrpc_thread sai_agl_thread; /* AGL thread */
diff --git a/drivers/staging/lustre/lustre/llite/statahead.c b/drivers/staging/lustre/lustre/llite/statahead.c
index e4ca525..b5bd107 100644
--- a/drivers/staging/lustre/lustre/llite/statahead.c
+++ b/drivers/staging/lustre/lustre/llite/statahead.c
@@ -1229,7 +1229,9 @@ do_it:
*/
ll_release_page(page, le32_to_cpu(dp->ldp_flags) &
LDF_COLLIDE);
+ sai->sai_in_readpage = 1;
page = ll_get_dir_page(dir, pos, &chain);
+ sai->sai_in_readpage = 0;
}
}

@@ -1548,6 +1550,11 @@ int do_statahead_enter(struct inode *dir, struct dentry **dentryp,
return entry ? 1 : -EAGAIN;
}

+ /* if statahead is busy in readdir, help it do post-work */
+ while (!ll_sa_entry_stated(entry) && sai->sai_in_readpage &&
+ !sa_received_empty(sai))
+ ll_post_statahead(sai);
+
if (!ll_sa_entry_stated(entry)) {
sai->sai_index_wait = entry->se_index;
lwi = LWI_TIMEOUT_INTR(cfs_time_seconds(30), NULL,
--
1.7.1
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