From 2e6d88e9d455fae9c4ac95c893362258f9540dfa Mon Sep 17 00:00:00 2001 From: Baolin Wang Date: Tue, 20 Aug 2024 17:49:17 +0800 Subject: [PATCH] selftests: mm: support shmem mTHP collapse testing Add shmem mTHP collpase testing. Similar to the anonymous page, users can use the '-s' parameter to specify the shmem mTHP size for testing. Link: https://lkml.kernel.org/r/fa44bfa20ca5b9fd6f9163a048f3d3c1e53cd0a8.1724140601.git.baolin.wang@linux.alibaba.com Signed-off-by: Baolin Wang Cc: Barry Song <21cnbao@gmail.com> Cc: David Hildenbrand Cc: Hugh Dickins Cc: Matthew Wilcox Cc: Ryan Roberts Cc: Yang Shi Cc: Zi Yan Signed-off-by: Andrew Morton --- tools/testing/selftests/mm/khugepaged.c | 4 +- tools/testing/selftests/mm/thp_settings.c | 46 ++++++++++++++++++++--- tools/testing/selftests/mm/thp_settings.h | 9 ++++- 3 files changed, 51 insertions(+), 8 deletions(-) diff --git a/tools/testing/selftests/mm/khugepaged.c b/tools/testing/selftests/mm/khugepaged.c index 829320a519e7..56d4480e8d3c 100644 --- a/tools/testing/selftests/mm/khugepaged.c +++ b/tools/testing/selftests/mm/khugepaged.c @@ -1095,7 +1095,7 @@ static void usage(void) fprintf(stderr, "\n\tSupported Options:\n"); fprintf(stderr, "\t\t-h: This help message.\n"); fprintf(stderr, "\t\t-s: mTHP size, expressed as page order.\n"); - fprintf(stderr, "\t\t Defaults to 0. Use this size for anon allocations.\n"); + fprintf(stderr, "\t\t Defaults to 0. Use this size for anon or shmem allocations.\n"); exit(1); } @@ -1209,6 +1209,8 @@ int main(int argc, char **argv) default_settings.khugepaged.pages_to_scan = hpage_pmd_nr * 8; default_settings.hugepages[hpage_pmd_order].enabled = THP_INHERIT; default_settings.hugepages[anon_order].enabled = THP_ALWAYS; + default_settings.shmem_hugepages[hpage_pmd_order].enabled = SHMEM_INHERIT; + default_settings.shmem_hugepages[anon_order].enabled = SHMEM_ALWAYS; save_settings(); thp_push_settings(&default_settings); diff --git a/tools/testing/selftests/mm/thp_settings.c b/tools/testing/selftests/mm/thp_settings.c index a4163438108e..577eaab6266f 100644 --- a/tools/testing/selftests/mm/thp_settings.c +++ b/tools/testing/selftests/mm/thp_settings.c @@ -33,10 +33,11 @@ static const char * const thp_defrag_strings[] = { }; static const char * const shmem_enabled_strings[] = { + "never", "always", "within_size", "advise", - "never", + "inherit", "deny", "force", NULL @@ -200,6 +201,7 @@ void thp_write_num(const char *name, unsigned long num) void thp_read_settings(struct thp_settings *settings) { unsigned long orders = thp_supported_orders(); + unsigned long shmem_orders = thp_shmem_supported_orders(); char path[PATH_MAX]; int i; @@ -234,12 +236,24 @@ void thp_read_settings(struct thp_settings *settings) settings->hugepages[i].enabled = thp_read_string(path, thp_enabled_strings); } + + for (i = 0; i < NR_ORDERS; i++) { + if (!((1 << i) & shmem_orders)) { + settings->shmem_hugepages[i].enabled = SHMEM_NEVER; + continue; + } + snprintf(path, PATH_MAX, "hugepages-%ukB/shmem_enabled", + (getpagesize() >> 10) << i); + settings->shmem_hugepages[i].enabled = + thp_read_string(path, shmem_enabled_strings); + } } void thp_write_settings(struct thp_settings *settings) { struct khugepaged_settings *khugepaged = &settings->khugepaged; unsigned long orders = thp_supported_orders(); + unsigned long shmem_orders = thp_shmem_supported_orders(); char path[PATH_MAX]; int enabled; int i; @@ -271,6 +285,15 @@ void thp_write_settings(struct thp_settings *settings) enabled = settings->hugepages[i].enabled; thp_write_string(path, thp_enabled_strings[enabled]); } + + for (i = 0; i < NR_ORDERS; i++) { + if (!((1 << i) & shmem_orders)) + continue; + snprintf(path, PATH_MAX, "hugepages-%ukB/shmem_enabled", + (getpagesize() >> 10) << i); + enabled = settings->shmem_hugepages[i].enabled; + thp_write_string(path, shmem_enabled_strings[enabled]); + } } struct thp_settings *thp_current_settings(void) @@ -324,17 +347,18 @@ void thp_set_read_ahead_path(char *path) dev_queue_read_ahead_path[sizeof(dev_queue_read_ahead_path) - 1] = '\0'; } -unsigned long thp_supported_orders(void) +static unsigned long __thp_supported_orders(bool is_shmem) { unsigned long orders = 0; char path[PATH_MAX]; char buf[256]; - int ret; - int i; + int ret, i; + char anon_dir[] = "enabled"; + char shmem_dir[] = "shmem_enabled"; for (i = 0; i < NR_ORDERS; i++) { - ret = snprintf(path, PATH_MAX, THP_SYSFS "hugepages-%ukB/enabled", - (getpagesize() >> 10) << i); + ret = snprintf(path, PATH_MAX, THP_SYSFS "hugepages-%ukB/%s", + (getpagesize() >> 10) << i, is_shmem ? shmem_dir : anon_dir); if (ret >= PATH_MAX) { printf("%s: Pathname is too long\n", __func__); exit(EXIT_FAILURE); @@ -347,3 +371,13 @@ unsigned long thp_supported_orders(void) return orders; } + +unsigned long thp_supported_orders(void) +{ + return __thp_supported_orders(false); +} + +unsigned long thp_shmem_supported_orders(void) +{ + return __thp_supported_orders(true); +} diff --git a/tools/testing/selftests/mm/thp_settings.h b/tools/testing/selftests/mm/thp_settings.h index 71cbff05f4c7..876235a23460 100644 --- a/tools/testing/selftests/mm/thp_settings.h +++ b/tools/testing/selftests/mm/thp_settings.h @@ -22,10 +22,11 @@ enum thp_defrag { }; enum shmem_enabled { + SHMEM_NEVER, SHMEM_ALWAYS, SHMEM_WITHIN_SIZE, SHMEM_ADVISE, - SHMEM_NEVER, + SHMEM_INHERIT, SHMEM_DENY, SHMEM_FORCE, }; @@ -46,6 +47,10 @@ struct khugepaged_settings { unsigned long pages_to_scan; }; +struct shmem_hugepages_settings { + enum shmem_enabled enabled; +}; + struct thp_settings { enum thp_enabled thp_enabled; enum thp_defrag thp_defrag; @@ -54,6 +59,7 @@ struct thp_settings { struct khugepaged_settings khugepaged; unsigned long read_ahead_kb; struct hugepages_settings hugepages[NR_ORDERS]; + struct shmem_hugepages_settings shmem_hugepages[NR_ORDERS]; }; int read_file(const char *path, char *buf, size_t buflen); @@ -76,5 +82,6 @@ void thp_save_settings(void); void thp_set_read_ahead_path(char *path); unsigned long thp_supported_orders(void); +unsigned long thp_shmem_supported_orders(void); #endif /* __THP_SETTINGS_H__ */