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Mon, 25 Aug 2025 07:57:56 -0700 (PDT) From: Yongting Lin To: anthony.yznaga@oracle.com, khalid@kernel.org, shuah@kernel.org, linyongting@bytedance.com Cc: linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, akpm@linux-foundation.org, linux-mm@kvack.org Subject: [PATCH 7/8] mshare: selftests: Add test case to demostrate the swaping of mshare memory Date: Mon, 25 Aug 2025 22:57:10 +0800 Message-Id: <20250825145719.29455-8-linyongting@bytedance.com> X-Mailer: git-send-email 2.39.5 (Apple Git-154) In-Reply-To: <20250825145719.29455-1-linyongting@bytedance.com> References: <20250825145719.29455-1-linyongting@bytedance.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: B5D6F40013 X-Stat-Signature: 4iqz3ccegsyuf47fw3m4fmrtbxbi4fg5 X-Rspam-User: X-HE-Tag: 1756133877-513679 X-HE-Meta: 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 P+FleVTx DzJuJKX9PdEhpNYe22WVYJIJmcZ1dxCcuBiwVerL/F8r6SxJgcYCOZ2M3d+t6uvPxCus/9wpIFCJW33YnodWHSkHYq1hwGMXmR21NC5qR7mmS9EgCD/9RIX2SBvIOBRG5poM6rWk2LXGRWSV+5ssUV8nMbk8De9gjU9iaAmEmb09UeYjbTQSqvjQuUjW2JtQP+nihwSoxkj5tktQwjv7Z4v3EWikcTijQrbXKbBDyRSwSaXaYL65JQNiAp/HrM1QFEBCsgQ/eUPsD5vbbTmF/FWm6kP2//3jNlIy0gYNcELPITj8CVs6Mq2rWYfxwLn6Ft+uhHUQmoOoJaI7i638L6fjXN+IfzPwqIchSlau0lL5WaiTnA9ywHAYPx6wM3K4U5+BcauYMj8bNnrrKeNzvis4KDA== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: This case is quit simple by using madvise(MADV_PAGEOUT), but for verifying the memory size of being swaped, we need to setup the memcg and attach test process to this memcg before perform the test. Signed-off-by: Yongting Lin --- tools/testing/selftests/mshare/Makefile | 2 +- tools/testing/selftests/mshare/memory.c | 71 +++++++++++++++++++++++++ 2 files changed, 72 insertions(+), 1 deletion(-) create mode 100644 tools/testing/selftests/mshare/memory.c diff --git a/tools/testing/selftests/mshare/Makefile b/tools/testing/selftests/mshare/Makefile index 651658d091c5..b0418b8c30f2 100644 --- a/tools/testing/selftests/mshare/Makefile +++ b/tools/testing/selftests/mshare/Makefile @@ -2,6 +2,6 @@ CFLAGS = $(KHDR_INCLUDES) -Wall -g -O2 -TEST_GEN_PROGS := basic +TEST_GEN_PROGS := basic memory include ../lib.mk diff --git a/tools/testing/selftests/mshare/memory.c b/tools/testing/selftests/mshare/memory.c new file mode 100644 index 000000000000..7754c0e33506 --- /dev/null +++ b/tools/testing/selftests/mshare/memory.c @@ -0,0 +1,71 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include + +#include "../kselftest_harness.h" +#include "util.c" + +#define GB(x) ((x) * (1UL << 30)) + +FIXTURE(memory) +{ + char filename[128]; + int fd; + + char cgroup[128]; + + void *addr; + size_t allocate_size; +}; + +FIXTURE_SETUP(memory) +{ + ASSERT_NE(create_mshare_test_cgroup(self->cgroup, sizeof(self->cgroup)), -1); + + attach_to_cgroup(self->cgroup); + + self->allocate_size = mshare_get_info(); + self->fd = create_mshare_file(self->filename, sizeof(self->filename)); + ASSERT_NE(self->fd, -1); + ASSERT_NE(ftruncate(self->fd, self->allocate_size), -1); + + ASSERT_NE(mshare_ioctl_mapping(self->fd, self->allocate_size, + MAP_ANONYMOUS | MAP_SHARED | MAP_FIXED), + -1); + self->addr = mmap(NULL, self->allocate_size, PROT_READ | PROT_WRITE, + MAP_SHARED, self->fd, 0); + ASSERT_NE(self->addr, MAP_FAILED); +} + +FIXTURE_TEARDOWN(memory) +{ + ASSERT_NE(munmap(self->addr, self->allocate_size), -1); + close(self->fd); + + ASSERT_NE(unlink(self->filename), -1); + dettach_from_cgroup(self->cgroup); + + ASSERT_NE(remove_cgroup(self->cgroup), -1); +} + +TEST_F(memory, swap) +{ + size_t swap_size; + + /* touch 1G memory */ + memset(self->addr, 0x01, GB(1)); + + /* force to reclaim the memory of mshare */ + ASSERT_NE(madvise(self->addr, GB(1), MADV_PAGEOUT), -1); + + swap_size = read_swap_from_cgroup(self->cgroup); + ASSERT_NE(swap_size, -1); + + /* convert to bytes */ + swap_size *= 4096; + + /* allow an error of 10% */ + ASSERT_GT(swap_size, GB(1) * 9 / 10); +} + +TEST_HARNESS_MAIN -- 2.20.1