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Thu, 19 Mar 2026 17:38:59 +0000 (UTC) Received: from llong-thinkpadp16vgen1.westford.csb (unknown [10.22.80.194]) by mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id E99A830002DF; Thu, 19 Mar 2026 17:38:55 +0000 (UTC) From: Waiman Long To: Johannes Weiner , Michal Hocko , Roman Gushchin , Shakeel Butt , Muchun Song , Andrew Morton , Tejun Heo , =?UTF-8?q?Michal=20Koutn=C3=BD?= , Shuah Khan , Mike Rapoport Cc: linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, Sean Christopherson , James Houghton , Sebastian Chlad , Guopeng Zhang , Li Wang , Waiman Long Subject: [PATCH 3/7] selftests: memcg: Iterate pages based on the actual page size Date: Thu, 19 Mar 2026 13:37:48 -0400 Message-ID: <20260319173752.1472864-4-longman@redhat.com> In-Reply-To: <20260319173752.1472864-1-longman@redhat.com> References: <20260319173752.1472864-1-longman@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 X-Mimecast-MFC-PROC-ID: hmL-c6m0ugK7mtEFvJzM96g4WLagOtTyz11vVv3IiHw_1773941939 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit content-type: text/plain; charset="US-ASCII"; x-default=true X-Rspamd-Queue-Id: 15BF2A0013 X-Stat-Signature: sqhqxh55d98kujugehs155pwfzhgz9f7 X-Rspam-User: X-Rspamd-Server: rspam05 X-HE-Tag: 1773941946-78254 X-HE-Meta: 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 iO5c9fyV nklH3C3GZpF2AIWViq4018eyl54cH+VakRCwvn7dywOUNwPfi+a6oif3HqeBT25DRJ1mjYM4a9tSKiEkS79DE7JshRjoZsGCOY5S1ARAouaDshv/OBV4HeqCmT9mB/yLs6hlsimbOElhOpobTG1CTpoeqn572GTfmrFUVna3kUXAy0RAD4IT9s8as/6gYPNmpVmlaGMriJ6Ns3+DSOgQgWu48HADcZls1CSelkIVFw0G6YLpAY0WAjNVgyvXQT5O+ugZIMs0dIdI5gRmRW8WpmXK5fydAYY3NNUXWzBaZaExC9YyqVVSIm1ORVOWXuEn7eMAGiBF3k2UyIfTBZCpXwb9nrQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: The current test_memcontrol test fault in memory by write a value to the start of a page based on the default value of 4k page size. Micro-optimize it by using the actual system page size to do the iteration. Signed-off-by: Waiman Long --- tools/testing/selftests/cgroup/test_memcontrol.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/tools/testing/selftests/cgroup/test_memcontrol.c b/tools/testing/selftests/cgroup/test_memcontrol.c index a25eb097b31c..3cc8a432be91 100644 --- a/tools/testing/selftests/cgroup/test_memcontrol.c +++ b/tools/testing/selftests/cgroup/test_memcontrol.c @@ -25,6 +25,7 @@ static bool has_localevents; static bool has_recursiveprot; +static int page_size; int get_temp_fd(void) { @@ -60,7 +61,7 @@ int alloc_anon(const char *cgroup, void *arg) char *buf, *ptr; buf = malloc(size); - for (ptr = buf; ptr < buf + size; ptr += PAGE_SIZE) + for (ptr = buf; ptr < buf + size; ptr += page_size) *ptr = 0; free(buf); @@ -183,7 +184,7 @@ static int alloc_anon_50M_check(const char *cgroup, void *arg) return -1; } - for (ptr = buf; ptr < buf + size; ptr += PAGE_SIZE) + for (ptr = buf; ptr < buf + size; ptr += page_size) *ptr = 0; current = cg_read_long(cgroup, "memory.current"); @@ -413,7 +414,7 @@ static int alloc_anon_noexit(const char *cgroup, void *arg) return -1; } - for (ptr = buf; ptr < buf + size; ptr += PAGE_SIZE) + for (ptr = buf; ptr < buf + size; ptr += page_size) *ptr = 0; while (getppid() == ppid) @@ -999,7 +1000,7 @@ static int alloc_anon_50M_check_swap(const char *cgroup, void *arg) return -1; } - for (ptr = buf; ptr < buf + size; ptr += PAGE_SIZE) + for (ptr = buf; ptr < buf + size; ptr += page_size) *ptr = 0; mem_current = cg_read_long(cgroup, "memory.current"); @@ -1679,6 +1680,7 @@ int main(int argc, char **argv) char root[PATH_MAX]; int i, proc_status; + page_size = sysconf(_SC_PAGE_SIZE); ksft_print_header(); ksft_set_plan(ARRAY_SIZE(tests)); if (cg_find_unified_root(root, sizeof(root), NULL)) -- 2.53.0