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| author | Thadeu Lima de Souza Cascardo <cascardo@canonical.com> | 2021-05-19 10:19:16 -0300 |
|---|---|---|
| committer | Cyril Hrubis <chrubis@suse.cz> | 2021-05-20 13:43:55 +0200 |
| commit | 9dcbf4e96a41ac69842e705d4dea51fc8e7b0860 (patch) | |
| tree | 35f373a397ebcc98101d0f99ffd285798cbe4bfc /testcases/kernel/mem | |
| parent | 6626dc8fd423ff04e2ff553c7bf9a5bedcf94b3b (diff) | |
| download | ltp-9dcbf4e96a41ac69842e705d4dea51fc8e7b0860.tar.gz | |
mtest06/mmap1: Further limit distant mmap size
Though on recent kernels (starting with 5.2, commit
8c7829b04c523cdc732cb77f59f03320e09f3386 ("mm: fix false-positive
OVERCOMMIT_GUESS failures"), overcommit accounting allows for allocating up
to MemTotal memory, older kernels have a much more complicated overcommit
guess accounting.
That leads to mmap failing on small enough systems:
mmap1.c:205: TBROK: mmap((nil),2088370176,3,34,-1,0) failed: ENOMEM (12)
Allocating only half of the total memory would generally work on test
systems.
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
Acked-by: Jan Stancek <jstancek@redhat.com>
Reviewed-by: Cyril Hrubis <chrubis@suse.cz>
Diffstat (limited to 'testcases/kernel/mem')
| -rw-r--r-- | testcases/kernel/mem/mtest06/mmap1.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/testcases/kernel/mem/mtest06/mmap1.c b/testcases/kernel/mem/mtest06/mmap1.c index 56588e1eb..10c47c35c 100644 --- a/testcases/kernel/mem/mtest06/mmap1.c +++ b/testcases/kernel/mem/mtest06/mmap1.c @@ -186,7 +186,7 @@ static void setup(void) { struct sigaction sigptr; size_t distant_mmap_size; - long mem_total; + size_t mem_total; page_sz = getpagesize(); mem_total = SAFE_READ_MEMINFO("MemTotal:"); @@ -195,7 +195,7 @@ static void setup(void) #ifdef TST_ABI32 distant_mmap_size = 256*1024*1024; #else - distant_mmap_size = (mem_total > 2 * GIGABYTE) ? 2 * GIGABYTE : mem_total; + distant_mmap_size = (mem_total > 4 * GIGABYTE) ? 2 * GIGABYTE : mem_total / 2; #endif /* * Used as hint for mmap thread, so it doesn't interfere |