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KVM: selftests: do not require 64GB in set_memory_region_test

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Unless the user sets overcommit_memory or has plenty of swap, the latest
changes to the testcase will result in ENOMEM failures for hosts with
less than 64GB RAM. As we do not use much of the allocated memory, we
can use MAP_NORESERVE to avoid this error.

Cc: Zenghui Yu <yuzenghui@huawei.com>
Cc: vkuznets@redhat.com
Cc: wanghaibin.wang@huawei.com
Cc: stable@vger.kernel.org
Fixes: 309505dd5685 ("KVM: selftests: Fix mapping length truncation in m{,un}map()")
Tested-by: Zenghui Yu <yuzenghui@huawei.com>
Link: https://lore.kernel.org/kvm/20210701160425.33666-1-borntraeger@de.ibm.com/
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Christian Borntraeger 2021-07-01 17:42:24 +02:00
parent fb5dad4084
commit cd4220d23b
1 changed files with 2 additions and 1 deletions
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3
tools/testing/selftests/kvm/set_memory_region_test.c
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@ -377,7 +377,8 @@ static void test_add_max_memory_regions(void)
(max_mem_slots - 1), MEM_REGION_SIZE >> 10);
mem = mmap(NULL, (size_t)max_mem_slots * MEM_REGION_SIZE + alignment,
PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE, -1, 0);
TEST_ASSERT(mem != MAP_FAILED, "Failed to mmap() host");
mem_aligned = (void *)(((size_t) mem + alignment - 1) & ~(alignment - 1));