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b=9cb4OuRPaWOdWforabLxXwOLqw1zKDYQa+ShB+/kdgjS63/olsM0itKjjLj6xakynQeS8m 00Hx6d9UuO8V62BQ== Received: from imap1.dmz-prg2.suse.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by imap1.dmz-prg2.suse.org (Postfix) with ESMTPS id C1A9C1368F for ; Thu, 27 Aug 2026 11:22:32 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id 2ttWLvgdkGqpawAAD6G6ig (envelope-from ) for ; Thu, 27 Aug 2026 11:22:32 +0000 From: Cyril Hrubis To: ltp@lists.linux.it Date: Thu, 27 Aug 2026 13:21:53 +0200 Message-ID: <20260827112157.1748734-28-chrubis@suse.cz> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260827112157.1748734-1-chrubis@suse.cz> References: <20260827112157.1748734-1-chrubis@suse.cz> MIME-Version: 1.0 X-Spamd-Result: default: False [-2.80 / 50.00]; BAYES_HAM(-3.00)[100.00%]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_MISSING_CHARSET(0.50)[]; NEURAL_HAM_SHORT(-0.20)[-0.997]; MIME_GOOD(-0.10)[text/plain]; ARC_NA(0.00)[]; RCPT_COUNT_ONE(0.00)[1]; RCVD_VIA_SMTP_AUTH(0.00)[]; MIME_TRACE(0.00)[0:+]; DKIM_SIGNED(0.00)[suse.cz:s=susede2_rsa,suse.cz:s=susede2_ed25519]; PREVIOUSLY_DELIVERED(0.00)[ltp@lists.linux.it]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo,suse.cz:mid,suse.cz:email]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; TO_DN_NONE(0.00)[]; RCVD_TLS_ALL(0.00)[] X-Virus-Scanned: clamav-milter 1.0.9 at in-5.smtp.seeweb.it X-Virus-Status: Clean Subject: [LTP] [PATCH v4 27/31] testcases: sysfs: Add sys_hugepages01 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/hugepages/hugepages-*/* files. Signed-off-by: Cyril Hrubis --- runtest/sysfs | 1 + testcases/kernel/sysfs/kernel/mm/Makefile | 7 + .../sysfs/kernel/mm/hugepages/.gitignore | 1 + .../kernel/sysfs/kernel/mm/hugepages/Makefile | 7 + .../kernel/mm/hugepages/sys_hugepages01.c | 138 ++++++++++++++++++ 5 files changed, 154 insertions(+) create mode 100644 testcases/kernel/sysfs/kernel/mm/Makefile create mode 100644 testcases/kernel/sysfs/kernel/mm/hugepages/.gitignore create mode 100644 testcases/kernel/sysfs/kernel/mm/hugepages/Makefile create mode 100644 testcases/kernel/sysfs/kernel/mm/hugepages/sys_hugepages01.c diff --git a/runtest/sysfs b/runtest/sysfs index 46593b82f..a81fbc12e 100644 --- a/runtest/sysfs +++ b/runtest/sysfs @@ -22,3 +22,4 @@ sys_net04 sys_net04 sys_block_loop01 sys_block_loop01 sys_block_queue01 sys_block_queue01 sys_block_size01 sys_block_size01 +sys_hugepages01 sys_hugepages01 diff --git a/testcases/kernel/sysfs/kernel/mm/Makefile b/testcases/kernel/sysfs/kernel/mm/Makefile new file mode 100644 index 000000000..9bc26552c --- /dev/null +++ b/testcases/kernel/sysfs/kernel/mm/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/env_pre.mk +include $(top_srcdir)/include/mk/generic_trunk_target.mk diff --git a/testcases/kernel/sysfs/kernel/mm/hugepages/.gitignore b/testcases/kernel/sysfs/kernel/mm/hugepages/.gitignore new file mode 100644 index 000000000..1c66028fb --- /dev/null +++ b/testcases/kernel/sysfs/kernel/mm/hugepages/.gitignore @@ -0,0 +1 @@ +/sys_hugepages01 diff --git a/testcases/kernel/sysfs/kernel/mm/hugepages/Makefile b/testcases/kernel/sysfs/kernel/mm/hugepages/Makefile new file mode 100644 index 000000000..781865569 --- /dev/null +++ b/testcases/kernel/sysfs/kernel/mm/hugepages/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/hugepages/sys_hugepages01.c b/testcases/kernel/sysfs/kernel/mm/hugepages/sys_hugepages01.c new file mode 100644 index 000000000..f47908d9a --- /dev/null +++ b/testcases/kernel/sysfs/kernel/mm/hugepages/sys_hugepages01.c @@ -0,0 +1,138 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (c) 2026 Cyril Hrubis + */ + +/*\ + * Sanity checks for the hugepage pool attributes exported under + * /sys/kernel/mm/hugepages/. + * + * Each supported hugepage size has its own hugepages-kB directory with a + * set of counters describing its pool. For each such directory the test + * verifies that: + * + * - the size encoded in the directory name is a power of two (in kB) + * - nr_hugepages, free_hugepages, resv_hugepages and surplus_hugepages are + * all non-negative + * - free_hugepages <= nr_hugepages + surplus_hugepages (the free count cannot + * exceed the total pool) + * - resv_hugepages <= free_hugepages (reserved pages are a subset of free) + * + * All checks skip gracefully with TCONF when a particular attribute is not + * present. + * + * /sys/kernel/mm/hugepages/ itself may not exist even with CONFIG_HUGETLBFS=y: + * hugetlb_init() in mm/hugetlb.c only calls hugetlb_sysfs_init() when + * hugepages_supported() is true, and on powerpc that additionally requires + * HPAGE_SHIFT != 0, i.e. hugetlbpage_init() having found at least one usable + * hugepage size at boot. + */ + +#include +#include +#include +#include +#include "tst_test.h" +#include "tst_sysfs_assert.h" +#include "tst_path_defs.h" + +static int read_count(const char *dir, const char *attr, long *val) +{ + char path[PATH_MAX]; + + snprintf(path, sizeof(path), PATH_MM_HUGEPAGES "/%s/%s", dir, attr); + + if (access(path, F_OK)) + return 1; + + if (FILE_SCANF(path, "%ld", val)) + return 1; + + return 0; +} + +static void check_size(const char *dir) +{ + long size; + + if (sscanf(dir, "hugepages-%ldkB", &size) != 1) { + tst_res(TFAIL, "Malformed hugepage directory name '%s'", dir); + return; + } + + if (size > 0 && !(size & (size - 1))) { + tst_res(TPASS, "%s: size %ld kB is a power of two", dir, size); + } else { + tst_res(TFAIL, "%s: size %ld kB is not a power of two", + dir, size); + } +} + +static void check_counts(const char *dir) +{ + long nr, free, resv, surplus; + + TST_SYSFS_ASSERT_RANGELL(0, LONG_MAX, PATH_MM_HUGEPAGES "/%s/nr_hugepages", dir); + TST_SYSFS_ASSERT_RANGELL(0, LONG_MAX, PATH_MM_HUGEPAGES "/%s/free_hugepages", dir); + TST_SYSFS_ASSERT_RANGELL(0, LONG_MAX, PATH_MM_HUGEPAGES "/%s/resv_hugepages", dir); + TST_SYSFS_ASSERT_RANGELL(0, LONG_MAX, + PATH_MM_HUGEPAGES "/%s/surplus_hugepages", dir); + + if (read_count(dir, "nr_hugepages", &nr) || + read_count(dir, "free_hugepages", &free) || + read_count(dir, "surplus_hugepages", &surplus)) + return; + + if (free <= nr + surplus) { + tst_res(TPASS, + "%s: free_hugepages (%ld) <= nr_hugepages (%ld) + surplus_hugepages (%ld)", + dir, free, nr, surplus); + } else { + tst_res(TFAIL, + "%s: free_hugepages (%ld) > nr_hugepages (%ld) + surplus_hugepages (%ld)", + dir, free, nr, surplus); + } + + if (read_count(dir, "resv_hugepages", &resv)) + return; + + if (resv <= free) { + tst_res(TPASS, "%s: resv_hugepages (%ld) <= free_hugepages (%ld)", + dir, resv, free); + } else { + tst_res(TFAIL, "%s: resv_hugepages (%ld) > free_hugepages (%ld)", + dir, resv, free); + } +} + +static void run(void) +{ + DIR *d; + struct dirent *ent; + int found = 0; + + d = TST_SYSFS_TRY_OPENDIR(PATH_MM_HUGEPAGES); + + while ((ent = SAFE_READDIR(d))) { + if (strncmp(ent->d_name, "hugepages-", 10)) + continue; + + found = 1; + tst_res(TINFO, "Checking hugepage pool '%s'", ent->d_name); + check_size(ent->d_name); + check_counts(ent->d_name); + } + + SAFE_CLOSEDIR(d); + + if (!found) + tst_res(TCONF, "No hugepage pools found"); +} + +static struct tst_test test = { + .test_all = run, + .needs_kconfigs = (const char *const[]){ + "CONFIG_HUGETLBFS=y", + NULL + }, +}; -- 2.54.0 -- Mailing list info: https://lists.linux.it/listinfo/ltp