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c4a6fce856
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Pasha Tatashin c4a6fce856 vmstat: kernel stack usage histogram 
As part of the dynamic kernel stack project, we need to know the amount of
data that can be saved by reducing the default kernel stack size [1].

Provide a kernel stack usage histogram to aid in optimizing kernel stack
sizes and minimizing memory waste in large-scale environments.  The
histogram divides stack usage into power-of-two buckets and reports the
results in /proc/vmstat.  This information is especially valuable in
environments with millions of machines, where even small optimizations can
have a significant impact.

The histogram data is presented in /proc/vmstat with entries like
"kstack_1k", "kstack_2k", and so on, indicating the number of threads that
exited with stack usage falling within each respective bucket.

Example outputs:
Intel:
$ grep kstack /proc/vmstat
kstack_1k 3
kstack_2k 188
kstack_4k 11391
kstack_8k 243
kstack_16k 0

ARM with 64K page_size:
$ grep kstack /proc/vmstat
kstack_1k 1
kstack_2k 340
kstack_4k 25212
kstack_8k 1659
kstack_16k 0
kstack_32k 0
kstack_64k 0

Note: once the dynamic kernel stack is implemented it will depend on the
implementation the usability of this feature: On hardware that supports
faults on kernel stacks, we will have other metrics that show the total
number of pages allocated for stacks.  On hardware where faults are not
supported, we will most likely have some optimization where only some
threads are extended, and for those, these metrics will still be very
useful.

[1] https://lwn.net/Articles/974367

Link: https://lkml.kernel.org/r/20240730150158.832783-3-pasha.tatashin@soleen.com
Link: https://lkml.kernel.org/r/20240724203322.2765486-3-pasha.tatashin@soleen.com
Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Reviewed-by: Kent Overstreet <kent.overstreet@linux.dev>
Acked-by: Shakeel Butt <shakeel.butt@linux.dev>
Cc: Domenico Cerasuolo <cerasuolodomenico@gmail.com>
Cc: Li Zhijian <lizhijian@fujitsu.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Nhat Pham <nphamcs@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2024-09-01 20:25:49 -07:00
..
damon mm/damon/lru_sort: adjust local variable to dynamic allocation 2024-09-01 20:25:45 -07:00
kasan kasan: fix bad call to unpoison_slab_object 2024-06-24 20:52:09 -07:00
kfence mm: remove CONFIG_MEMCG_KMEM 2024-07-10 12:14:54 -07:00
kmsan kmsan: do not pass NULL pointers as 0 2024-07-03 19:30:26 -07:00
backing-dev.c writeback: support retrieving per group debug writeback stats of bdi 2024-05-05 17:53:51 -07:00
balloon_compaction.c mm: remove MIGRATE_SYNC_NO_COPY mode 2024-07-03 19:30:00 -07:00
bootmem_info.c
cma_debug.c
cma_sysfs.c mm/cma: add sysfs file 'release_pages_success' 2024-02-22 10:24:57 -08:00
cma.c mm/cma: drop incorrect alignment check in cma_init_reserved_mem 2024-04-25 20:56:42 -07:00
cma.h mm/cma: add sysfs file 'release_pages_success' 2024-02-22 10:24:57 -08:00
compaction.c sysctl: treewide: constify the ctl_table argument of proc_handlers 2024-07-24 20:59:29 +02:00
debug_page_alloc.c mm: page_alloc: consolidate free page accounting 2024-04-25 20:56:04 -07:00
debug_page_ref.c
debug_vm_pgtable.c mm/debug_vm_pgtable: drop RANDOM_ORVALUE trick 2024-06-15 10:43:08 -07:00
debug.c mm/debug: print only page mapcount (excluding folio entire mapcount) in __dump_folio() 2024-05-05 17:53:31 -07:00
dmapool_test.c mm/dmapool: add MODULE_DESCRIPTION() 2024-07-03 19:29:58 -07:00
dmapool.c
early_ioremap.c
execmem.c mm/execmem, arch: convert remaining overrides of module_alloc to execmem 2024-05-14 00:31:43 -07:00
fadvise.c
fail_page_alloc.c mm, page_alloc: put should_fail_alloc_page() back behing CONFIG_FAIL_PAGE_ALLOC 2024-07-17 21:05:18 -07:00
failslab.c mm, slab: put should_failslab() back behind CONFIG_SHOULD_FAILSLAB 2024-07-17 21:05:18 -07:00
filemap.c - 875fa64577 ("mm/hugetlb_vmemmap: fix race with speculative PFN 2024-07-21 17:15:46 -07:00
folio-compat.c mm: remove page_mapping() 2024-07-03 19:29:59 -07:00
gup_test.c
gup_test.h
gup.c mm: remove foll_flags in __get_user_pages 2024-09-01 20:25:46 -07:00
highmem.c mm/highmem: make nr_free_highpages() return "unsigned long" 2024-07-03 19:30:06 -07:00
hmm.c mm: provide mm_struct and address to huge_ptep_get() 2024-07-12 15:52:15 -07:00
huge_memory.c memory tiering: introduce folio_use_access_time() check 2024-09-01 20:25:47 -07:00
hugetlb_cgroup.c mm/hugetlb_cgroup: switch to the new cftypes 2024-07-03 19:30:10 -07:00
hugetlb_vmemmap.c mm/hugetlb_vmemmap: don't synchronize_rcu() without HVO 2024-09-01 20:25:45 -07:00
hugetlb_vmemmap.h
hugetlb.c sysctl: treewide: constify the ctl_table argument of proc_handlers 2024-07-24 20:59:29 +02:00
hwpoison-inject.c mm/hwpoison: add MODULE_DESCRIPTION() 2024-07-03 19:29:58 -07:00
init-mm.c
internal.h Merge branch 'mm-hotfixes-stable' into mm-stable to pick up "mm: fix 2024-07-06 11:44:41 -07:00
interval_tree.c
io-mapping.c
ioremap.c
Kconfig - 875fa64577 ("mm/hugetlb_vmemmap: fix race with speculative PFN 2024-07-21 17:15:46 -07:00
Kconfig.debug mm/slub: unify all sl[au]b parameters with "slab_$param" 2024-01-22 10:31:08 +01:00
khugepaged.c - 875fa64577 ("mm/hugetlb_vmemmap: fix race with speculative PFN 2024-07-21 17:15:46 -07:00
kmemleak.c mm/kmemleak: replace strncpy() with strscpy() 2024-07-17 21:05:18 -07:00
ksm.c Random number generator updates for Linux 6.11-rc1. 2024-07-24 10:29:50 -07:00
list_lru.c mm: list_lru: fix UAF for memory cgroup 2024-08-07 18:33:56 -07:00
maccess.c
madvise.c Random number generator updates for Linux 6.11-rc1. 2024-07-24 10:29:50 -07:00
Makefile shmem_quota: build the object file conditionally to the config option 2024-09-01 20:25:45 -07:00
mapping_dirty_helpers.c
memblock.c memblock: updates for 6.11-rc1 2024-07-18 14:48:11 -07:00
memcontrol-v1.c memcg_write_event_control(): fix a user-triggerable oops 2024-08-12 21:58:44 -04:00
memcontrol-v1.h mm: memcg: gather memcg1-specific fields initialization in memcg1_memcg_init() 2024-07-04 18:05:56 -07:00
memcontrol.c memcg: increase the valid index range for memcg stats 2024-09-01 20:25:49 -07:00
memfd.c mm/gup: introduce memfd_pin_folios() for pinning memfd folios 2024-07-12 15:52:09 -07:00
memory_hotplug.c mm/page_alloc: put __free_pages_core() in __meminit section 2024-07-12 15:52:21 -07:00
memory-failure.c mm/memory-failure: use raw_spinlock_t in struct memory_failure_cpu 2024-08-15 22:16:14 -07:00
memory-tiers.c memory tiering: introduce folio_use_access_time() check 2024-09-01 20:25:47 -07:00
memory.c memory tiering: introduce folio_use_access_time() check 2024-09-01 20:25:47 -07:00
mempolicy.c Random number generator updates for Linux 6.11-rc1. 2024-07-24 10:29:50 -07:00
mempool.c mm: fix xyz_noprof functions calling profiled functions 2024-06-05 19:19:26 -07:00
memremap.c mm: convert put_devmap_managed_page_refs() to put_devmap_managed_folio_refs() 2024-05-05 17:53:49 -07:00
memtest.c memtest: use {READ,WRITE}_ONCE in memory scanning 2024-03-13 12:12:21 -07:00
migrate_device.c mm: extend rmap flags arguments for folio_add_new_anon_rmap 2024-07-03 19:30:18 -07:00
migrate.c memory tiering: count PGPROMOTE_SUCCESS when mem tiering is enabled. 2024-09-01 20:25:47 -07:00
mincore.c mm: provide mm_struct and address to huge_ptep_get() 2024-07-12 15:52:15 -07:00
mlock.c Random number generator updates for Linux 6.11-rc1. 2024-07-24 10:29:50 -07:00
mm_init.c alloc_tag: mark pages reserved during CMA activation as not tagged 2024-08-15 22:16:16 -07:00
mm_slot.h
mmap_lock.c mm: mmap_lock: replace get_memcg_path_buf() with on-stack buffer 2024-07-03 19:30:26 -07:00
mmap.c Random number generator updates for Linux 6.11-rc1. 2024-07-24 10:29:50 -07:00
mmu_gather.c mm/mmu_gather: improve cond_resched() handling with large folios and expensive page freeing 2024-02-22 15:27:17 -08:00
mmu_notifier.c mmu_notifier: remove the .change_pte() callback 2024-04-11 13:18:36 -04:00
mmzone.c
mprotect.c memory tiering: introduce folio_use_access_time() check 2024-09-01 20:25:47 -07:00
mremap.c mm: remove page_mkclean() 2024-07-03 19:30:17 -07:00
mseal.c mseal: fix is_madv_discard() 2024-08-15 22:16:13 -07:00
msync.c
nommu.c mm: vmalloc: implement vrealloc() 2024-09-01 20:25:43 -07:00
oom_kill.c memory: remove the now superfluous sentinel element from ctl_table array 2024-04-25 20:56:32 -07:00
page_alloc.c alloc_tag: introduce clear_page_tag_ref() helper function 2024-08-15 22:16:16 -07:00
page_counter.c mm/page_counter: move calculating protection values to page_counter 2024-07-12 15:52:20 -07:00
page_ext.c mm: don't account memmap per-node 2024-08-15 22:16:14 -07:00
page_idle.c
page_io.c mm: ignore data-race in __swap_writepage 2024-07-17 21:05:18 -07:00
page_isolation.c mm: page_isolation: prepare for hygienic freelists 2024-04-25 20:56:04 -07:00
page_owner.c mm/page-owner: use gfp_nested_mask() instead of open coded masking 2024-05-19 14:40:44 -07:00
page_poison.c
page_reporting.c
page_reporting.h
page_table_check.c mm/page_table_check: fix crash on ZONE_DEVICE 2024-06-15 10:43:04 -07:00
page_vma_mapped.c mm: make page_mapped_in_vma conditional on CONFIG_MEMORY_FAILURE 2024-05-05 17:53:45 -07:00
page-writeback.c sysctl: treewide: constify the ctl_table argument of proc_handlers 2024-07-24 20:59:29 +02:00
pagewalk.c mm: remove CONFIG_ARCH_HAS_HUGEPD 2024-07-12 15:52:19 -07:00
percpu-internal.h mm: remove CONFIG_MEMCG_KMEM 2024-07-10 12:14:54 -07:00
percpu-km.c
percpu-stats.c
percpu-vm.c percpu: clean up all mappings when pcpu_map_pages() fails 2024-04-25 20:55:49 -07:00
percpu.c mm: remove CONFIG_MEMCG_KMEM 2024-07-10 12:14:54 -07:00
pgalloc-track.h
pgtable-generic.c mm: fix race between __split_huge_pmd_locked() and GUP-fast 2024-05-07 10:37:00 -07:00
process_vm_access.c
ptdump.c mm: ptdump: add check_wx_pages debugfs attribute 2024-02-22 10:24:47 -08:00
readahead.c Merge branch 'mm-hotfixes-stable' into mm-stable to pick up "mm: fix 2024-07-06 11:44:41 -07:00
rmap.c mm: shrink skip folio mapped by an exiting process 2024-09-01 20:25:48 -07:00
rodata_test.c
secretmem.c
shmem_quota.c shmem_quota: build the object file conditionally to the config option 2024-09-01 20:25:45 -07:00
shmem.c mm: shmem: move shmem_huge_global_enabled() into shmem_allowable_huge_orders() 2024-09-01 20:25:44 -07:00
show_mem.c lib: add memory allocations report in show_mem() 2024-04-25 20:55:57 -07:00
shrinker_debug.c
shrinker.c
shuffle.c
shuffle.h
slab_common.c - 875fa64577 ("mm/hugetlb_vmemmap: fix race with speculative PFN 2024-07-21 17:15:46 -07:00
slab.h - 875fa64577 ("mm/hugetlb_vmemmap: fix race with speculative PFN 2024-07-21 17:15:46 -07:00
slub.c mm, slub: do not call do_slab_free for kfence object 2024-07-30 11:50:00 +02:00
sparse-vmemmap.c mm: don't account memmap per-node 2024-08-15 22:16:14 -07:00
sparse.c mm: don't account memmap per-node 2024-08-15 22:16:14 -07:00
swap_cgroup.c
swap_slots.c mm: swap: update get_swap_pages() to take folio order 2024-04-25 20:56:37 -07:00
swap_state.c mm: swap_state: use folio_alloc_mpol() in __read_swap_cache_async() 2024-07-12 15:52:22 -07:00
swap.c mm/swap: remove boilerplate 2024-09-01 20:25:48 -07:00
swap.h mm: swap: remove 'synchronous' argument to swap_read_folio() 2024-07-03 19:30:06 -07:00
swapfile.c mm: extend 'usage' parameter so that cluster_swap_free_nr() can be reused 2024-09-01 20:25:46 -07:00
truncate.c mm: Fix missing folio invalidation calls during truncation 2024-08-24 16:09:16 +02:00
usercopy.c
userfaultfd.c mm: provide mm_struct and address to huge_ptep_get() 2024-07-12 15:52:15 -07:00
util.c mm: kvmalloc: align kvrealloc() with krealloc() 2024-09-01 20:25:44 -07:00
vmalloc.c mm: vmalloc: implement vrealloc() 2024-09-01 20:25:43 -07:00
vmpressure.c
vmscan.c mm: shrink skip folio mapped by an exiting process 2024-09-01 20:25:48 -07:00
vmstat.c vmstat: kernel stack usage histogram 2024-09-01 20:25:49 -07:00
workingset.c cachestat: do not flush stats in recency check 2024-07-03 22:40:37 -07:00
z3fold.c mm: zpool: return pool size in pages 2024-04-25 20:55:48 -07:00
zbud.c mm: zpool: return pool size in pages 2024-04-25 20:55:48 -07:00
zpool.c mm: zpool: return pool size in pages 2024-04-25 20:55:48 -07:00
zsmalloc.c minmax: make generic MIN() and MAX() macros available everywhere 2024-07-28 15:49:18 -07:00
zswap.c mm/zswap: fix a white space issue 2024-07-17 21:08:55 -07:00