File 0001-memcontrol03-Using-clean-page-cache-to-avo... of Package ltp-stable

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File 0001-memcontrol03-Using-clean-page-cache-to-avoid-depende.patch of Package ltp-stable (Revision ff07696f5382556895cff0ba3e01c57a)

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From ab1c8d16eb131969133edaa79f39e5443216100a Mon Sep 17 00:00:00 2001
From: Wei Gao <wegao@suse.com>
Date: Thu, 14 Mar 2024 23:31:39 -0400
Subject: [PATCH] memcontrol03: Using clean page cache to avoid dependency on
 IO rate

Bad IO situation (storage bandwidth ~10MB/sec) will lead background
writeback has uncertain progress for dirty page. Then system can not
reclaim enough memory for new process and finally lead a unexpected
OOM. Use fsync() to make sure that the pages from the file we wrote into
are written to a permanent storage.

memcontrol03.c:218: TPASS: Expect: (A/B/E memory.current=0) ~= 0
memcontrol03.c:116: TPASS: Child 1918 killed by OOM
memcontrol03.c:224: TPASS: Expect: (A/B memory.current=52588544) ~= 52428800
memcontrol03.c:129: TFAIL: Expected child 1944 to exit(0), but instead killed by SIGKILL

Link: https://lore.kernel.org/ltp/20240315033139.20557-1-wegao@suse.com/
Fixes: https://bugzilla.suse.com/show_bug.cgi?id=1218178
Suggested-by: Cyril Hrubis <chrubis@suse.cz>
Reviewed-by: Petr Vorel <pvorel@suse.cz>
Signed-off-by: Wei Gao <wegao@suse.com>
---
 testcases/kernel/controllers/memcg/memcontrol03.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/testcases/kernel/controllers/memcg/memcontrol03.c b/testcases/kernel/controllers/memcg/memcontrol03.c
index e927dfd19..6d9c490b5 100644
--- a/testcases/kernel/controllers/memcg/memcontrol03.c
+++ b/testcases/kernel/controllers/memcg/memcontrol03.c
@@ -144,6 +144,7 @@ static void alloc_pagecache_in_child(const struct tst_cg_group *const cg,
 	tst_res(TINFO, "Child %d in %s: Allocating pagecache: %"PRIdPTR,
 		getpid(), tst_cg_group_name(cg), size);
 	alloc_pagecache(fd, size);
+	SAFE_FSYNC(fd);
 
 	TST_CHECKPOINT_WAKE(CHILD_IDLE);
 	TST_CHECKPOINT_WAIT(TEST_DONE);
-- 
2.43.0

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File 0001-memcontrol03-Using-clean-page-cache-to-avoid-depende.patch of Package ltp-stable (Revision ff07696f5382556895cff0ba3e01c57a)

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