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| author | Stefan Roesch <shr@devkernel.io> | 2023-04-17 22:13:41 -0700 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-04-21 14:52:03 -0700 |
| commit | d21077fbc2fc987c2e593c34dc3b4d84e546dc9f (patch) | |
| tree | 1a56ca5e4613bc2a491ddbcb3d62c7064c97f276 /include/linux/ksm.h | |
| parent | d7597f59d1d33e9efbffa7060deb9ee5bd119e62 (diff) | |
| download | lwn-d21077fbc2fc987c2e593c34dc3b4d84e546dc9f.tar.gz lwn-d21077fbc2fc987c2e593c34dc3b4d84e546dc9f.zip | |
mm: add new KSM process and sysfs knobs
This adds the general_profit KSM sysfs knob and the process profit metric
knobs to ksm_stat.
1) expose general_profit metric
The documentation mentions a general profit metric, however this
metric is not calculated. In addition the formula depends on the size
of internal structures, which makes it more difficult for an
administrator to make the calculation. Adding the metric for a better
user experience.
2) document general_profit sysfs knob
3) calculate ksm process profit metric
The ksm documentation mentions the process profit metric and how to
calculate it. This adds the calculation of the metric.
4) mm: expose ksm process profit metric in ksm_stat
This exposes the ksm process profit metric in /proc/<pid>/ksm_stat.
The documentation mentions the formula for the ksm process profit
metric, however it does not calculate it. In addition the formula
depends on the size of internal structures. So it makes sense to
expose it.
5) document new procfs ksm knobs
Link: https://lkml.kernel.org/r/20230418051342.1919757-3-shr@devkernel.io
Signed-off-by: Stefan Roesch <shr@devkernel.io>
Reviewed-by: Bagas Sanjaya <bagasdotme@gmail.com>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Rik van Riel <riel@surriel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'include/linux/ksm.h')
| -rw-r--r-- | include/linux/ksm.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/ksm.h b/include/linux/ksm.h index 4647b0c70c12..7a9b76fb6c3f 100644 --- a/include/linux/ksm.h +++ b/include/linux/ksm.h @@ -68,6 +68,11 @@ void folio_migrate_ksm(struct folio *newfolio, struct folio *folio); void collect_procs_ksm(struct page *page, struct list_head *to_kill, int force_early); #endif + +#ifdef CONFIG_PROC_FS +long ksm_process_profit(struct mm_struct *); +#endif /* CONFIG_PROC_FS */ + #else /* !CONFIG_KSM */ static inline void ksm_add_vma(struct vm_area_struct *vma) |