libhugetlbfs/SOURCES/0031-tests-noresv-preserve-resv-page-Fix-failure-in-case-.patch

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2020-01-21 19:55:32 +00:00
From e9482399d7eee7199a4a31fe943c940f52a245ba Mon Sep 17 00:00:00 2001
Message-Id: <e9482399d7eee7199a4a31fe943c940f52a245ba.1566225007.git.aquini@redhat.com>
In-Reply-To: <d42f467a923dfc09309acb7a83b42e3285fbd8f4.1566225007.git.aquini@redhat.com>
References: <d42f467a923dfc09309acb7a83b42e3285fbd8f4.1566225007.git.aquini@redhat.com>
From: Sandipan Das <sandipan@linux.ibm.com>
Date: Mon, 19 Aug 2019 14:48:38 +0530
Subject: [RHEL7 PATCH 31/31] tests: noresv-preserve-resv-page: Fix failure in
case of overcommit
This adds an additional check to see if the mapping created
with MAP_NORESERVE does not raise a SIGBUS upon being written
to because nr_overcommit_pages is set to a non-zero value and
surplus pages gets provisioned. In this case, the test should
pass.
Signed-off-by: Sandipan Das <sandipan@linux.ibm.com>
Signed-off-by: Eric B Munson <eric@munsonfam.org>
Signed-off-by: Rafael Aquini <aquini@redhat.com>
---
tests/noresv-preserve-resv-page.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/tests/noresv-preserve-resv-page.c b/tests/noresv-preserve-resv-page.c
index b7b8043..b93bf36 100644
--- a/tests/noresv-preserve-resv-page.c
+++ b/tests/noresv-preserve-resv-page.c
@@ -66,6 +66,7 @@ int main(int argc, char *argv[])
{
long hpage_size;
int nr_hugepages;
+ int surp_hugepages;
int fd1, fd2, err;
char *p, *q;
struct sigaction sa = {
@@ -104,6 +105,13 @@ int main(int argc, char *argv[])
verbose_printf("Write to %p to steal reserved page\n", q);
+ surp_hugepages = get_huge_page_counter(hpage_size, HUGEPAGES_SURP);
test_write(q);
+
+ /* Provisioning succeeded because of overcommit */
+ if (get_huge_page_counter(hpage_size, HUGEPAGES_SURP) ==
+ surp_hugepages + 1)
+ PASS();
+
FAIL("Steal reserved page");
}
--
1.8.3.1