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BAYES_HAM(-3.00)[100.00%]; NEURAL_HAM_LONG(-1.00)[-1.000]; MID_CONTAINS_FROM(1.00)[]; R_MISSING_CHARSET(0.50)[]; R_DKIM_ALLOW(-0.20)[suse.cz:s=susede2_rsa,suse.cz:s=susede2_ed25519]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; RCPT_COUNT_ONE(0.00)[1]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; FROM_HAS_DN(0.00)[]; SPAMHAUS_XBL(0.00)[2a07:de40:b281:104:10:150:64:97:from]; MIME_TRACE(0.00)[0:+]; PREVIOUSLY_DELIVERED(0.00)[ltp@lists.linux.it]; FROM_EQ_ENVFROM(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo,imap1.dmz-prg2.suse.org:rdns,suse.cz:dkim,suse.cz:email,suse.cz:mid]; DKIM_SIGNED(0.00)[suse.cz:s=susede2_rsa,suse.cz:s=susede2_ed25519]; RCVD_TLS_ALL(0.00)[]; TO_DN_NONE(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; DNSWL_BLOCKED(0.00)[2a07:de40:b281:104:10:150:64:97:from]; DKIM_TRACE(0.00)[suse.cz:+] X-Virus-Scanned: clamav-milter 1.0.9 at in-4.smtp.seeweb.it X-Virus-Status: Clean Subject: [LTP] [PATCH v4 29/31] testcases: sysfs: Add sys_ksm01 X-BeenThere: ltp@lists.linux.it X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux Test Project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: ltp-bounces+ltp=archiver.kernel.org@lists.linux.it Sender: "ltp" A test for /sys/kernel/mm/ksm/* files. Signed-off-by: Cyril Hrubis --- runtest/sysfs | 1 + .../kernel/sysfs/kernel/mm/ksm/.gitignore | 1 + testcases/kernel/sysfs/kernel/mm/ksm/Makefile | 7 +++ .../kernel/sysfs/kernel/mm/ksm/sys_ksm01.c | 63 +++++++++++++++++++ 4 files changed, 72 insertions(+) create mode 100644 testcases/kernel/sysfs/kernel/mm/ksm/.gitignore create mode 100644 testcases/kernel/sysfs/kernel/mm/ksm/Makefile create mode 100644 testcases/kernel/sysfs/kernel/mm/ksm/sys_ksm01.c diff --git a/runtest/sysfs b/runtest/sysfs index ec38d8b44..08358ebc6 100644 --- a/runtest/sysfs +++ b/runtest/sysfs @@ -24,3 +24,4 @@ sys_block_queue01 sys_block_queue01 sys_block_size01 sys_block_size01 sys_hugepages01 sys_hugepages01 sys_hugepages02 sys_hugepages02 +sys_ksm01 sys_ksm01 diff --git a/testcases/kernel/sysfs/kernel/mm/ksm/.gitignore b/testcases/kernel/sysfs/kernel/mm/ksm/.gitignore new file mode 100644 index 000000000..92fa7e2c1 --- /dev/null +++ b/testcases/kernel/sysfs/kernel/mm/ksm/.gitignore @@ -0,0 +1 @@ +/sys_ksm01 diff --git a/testcases/kernel/sysfs/kernel/mm/ksm/Makefile b/testcases/kernel/sysfs/kernel/mm/ksm/Makefile new file mode 100644 index 000000000..781865569 --- /dev/null +++ b/testcases/kernel/sysfs/kernel/mm/ksm/Makefile @@ -0,0 +1,7 @@ +# SPDX-License-Identifier: GPL-2.0-or-later +# Copyright (c) 2026 Cyril Hrubis + +top_srcdir ?= ../../../../../.. + +include $(top_srcdir)/include/mk/testcases.mk +include $(top_srcdir)/include/mk/generic_leaf_target.mk diff --git a/testcases/kernel/sysfs/kernel/mm/ksm/sys_ksm01.c b/testcases/kernel/sysfs/kernel/mm/ksm/sys_ksm01.c new file mode 100644 index 000000000..c53ff551a --- /dev/null +++ b/testcases/kernel/sysfs/kernel/mm/ksm/sys_ksm01.c @@ -0,0 +1,63 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (c) 2026 Cyril Hrubis + */ + +/*\ + * Sanity checks for the Kernel Samepage Merging (KSM) attributes exported + * under /sys/kernel/mm/ksm/. + * + * The test verifies that: + * + * - run is one of 0 (stop), 1 (run) or 2 (unmerge) + * - merge_across_nodes and use_zero_pages are booleans + * - max_page_sharing is greater than 2 and less than INT_MAX + * - pages_to_scan and sleep_millisecs are non-negative + * - the page accounting counters (pages_shared, pages_sharing, pages_unshared, + * pages_volatile, stable_node_chains, stable_node_dups) are non-negative + * + * All checks skip gracefully with TCONF when a particular attribute is not + * present, since the set of KSM tunables differs between kernel versions. + */ + +#include +#include "tst_test.h" +#include "tst_sysfs_assert.h" +#include "tst_path_defs.h" + +static const char *const nonneg_counters[] = { + "pages_shared", + "pages_sharing", + "pages_unshared", + "pages_volatile", + "stable_node_chains", + "stable_node_dups", + "pages_to_scan", + "sleep_millisecs", +}; + +static void do_test(void) +{ + unsigned int i; + + /* 0 = stop, 1 = merge, 2 = unmerge */ + TST_SYSFS_ASSERT_RANGELL(0, 2, PATH_MM_KSM "/run"); + + TST_SYSFS_ASSERT_BOOL(PATH_MM_KSM "/merge_across_nodes"); + TST_SYSFS_ASSERT_BOOL(PATH_MM_KSM "/use_zero_pages"); + + TST_SYSFS_ASSERT_RANGELL(2, INT_MAX, PATH_MM_KSM "/max_page_sharing"); + + for (i = 0; i < ARRAY_SIZE(nonneg_counters); i++) { + TST_SYSFS_ASSERT_RANGEUU(0, ULONG_MAX, PATH_MM_KSM "/%s", + nonneg_counters[i]); + } +} + +static struct tst_test test = { + .test_all = do_test, + .needs_kconfigs = (const char *const[]){ + "CONFIG_KSM=y", + NULL + }, +}; -- 2.54.0 -- Mailing list info: https://lists.linux.it/listinfo/ltp