From: Alex Zhuravlev <bzzz@whamcloud.com>
Date: Mon, 11 Mar 2024 07:42:24 +0000 (+0300)
Subject: LU-17630 osc: add cond_resched() to osc_lru_shrink()
X-Git-Tag: 2.15.63~45
X-Git-Url: https://git.whamcloud.com/?a=commitdiff_plain;h=69eb7b89c7f36ec6a8970e87fc8859207f4b9c0c;p=fs%2Flustre-release.git

LU-17630 osc: add cond_resched() to osc_lru_shrink()

osc_lru_shrink() may need to handle lots of pages and this way
can block scheduling for long. add couple cond_resched() to
prevent kernel warnings and other thread's starvation.

Signed-off-by: Alex Zhuravlev <bzzz@whamcloud.com>
Change-Id: I862c568ac777c0b929a1ffb61e246b079aee6718
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/54346
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Patrick Farrell <patrick.farrell@oracle.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
---

diff --git a/lustre/osc/osc_page.c b/lustre/osc/osc_page.c
index 7c54153..b97d4f9 100644
--- a/lustre/osc/osc_page.c
+++ b/lustre/osc/osc_page.c
@@ -613,6 +613,7 @@ long osc_lru_shrink(const struct lu_env *env, struct client_obd *cli,
 				cl_io_fini(env, io);
 				cl_object_put(env, clobj);
 				clobj = NULL;
+				cond_resched();
 			}
 
 			clobj = tmp;
@@ -668,6 +669,7 @@ long osc_lru_shrink(const struct lu_env *env, struct client_obd *cli,
 
 		cl_io_fini(env, io);
 		cl_object_put(env, clobj);
+		cond_resched();
 	}
 
 	atomic_dec(&cli->cl_lru_shrinkers);