From: Daniel Gomez <da.gomez@samsung.com>
Date: Wed, 18 Jun 2025 13:00:12 +0000 (+0200)
Subject: generic/551: prevent OOM when running on tmpfs with low memory
X-Git-Tag: v2025.06.22~4
X-Git-Url: http://git.apps.os.sepia.ceph.com/?a=commitdiff_plain;h=e17714ed95441bf2a2ee80c6e0f8af3841ffb255;p=xfstests-dev.git

generic/551: prevent OOM when running on tmpfs with low memory

Running generic/551 on a tmpfs filesystem with less than 10 GB (ish)
of RAM can lead to the system running out of memory, triggering the
kernel's OOM killer and terminating the aio-dio-write-v process.

Fix generic/551 by substracting the amount of available memory allocated
for the tmpfs scratch device to the total available free memory.

Reported-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Daniel Gomez <da.gomez@samsung.com>
Reviewed-by: Zorro Lang <zlang@redhat.com>
Signed-off-by: Zorro Lang <zlang@kernel.org>
---

diff --git a/tests/generic/551 b/tests/generic/551
index 4a7f0a63..267c57ec 100755
--- a/tests/generic/551
+++ b/tests/generic/551
@@ -39,6 +39,10 @@ do_test()
 	local total_size=0
 	local avail_mem=`_available_memory_bytes`
 
+	# To avoid OOM on tmpfs, subtract the amount of available memory
+	# allocated for the tmpfs
+	[ "$FSTYP" = "tmpfs" ] && avail_mem=$((avail_mem - free_size_k * 1024))
+
 	# the number of AIO write operation
 	num_oper=$((RANDOM % 64 + 1))