| Message ID | 20230123173748.1734238-16-shr@devkernel.io (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | mm: process/cgroup ksm support | expand |
On Mon, Jan 23, 2023 at 09:37:43AM -0800, Stefan Roesch wrote: > This documents the ksm_process_profit and ksm_merge_type settings in > ksm_stat. "Document both ksm_process_profit and ksm_merge_type proc settings." > > Signed-off-by: Stefan Roesch <shr@devkernel.io> > --- > Documentation/admin-guide/mm/ksm.rst | 6 +++++- > 1 file changed, 5 insertions(+), 1 deletion(-) > > diff --git a/Documentation/admin-guide/mm/ksm.rst b/Documentation/admin-guide/mm/ksm.rst > index 72189bf1283e..70896f01d641 100644 > --- a/Documentation/admin-guide/mm/ksm.rst > +++ b/Documentation/admin-guide/mm/ksm.rst > @@ -211,7 +211,8 @@ several times, which are unprofitable memory consumed. > ksm_rmap_items * sizeof(rmap_item). > > where ksm_merging_pages is shown under the directory ``/proc/<pid>/``, > - and ksm_rmap_items is shown in ``/proc/<pid>/ksm_stat``. > + and ksm_rmap_items is shown in ``/proc/<pid>/ksm_stat``. The process profit > + is also shown in ``/proc/<pid>/ksm_stat`` as ksm_process_profit. > > From the perspective of application, a high ratio of ``ksm_rmap_items`` to > ``ksm_merging_pages`` means a bad madvise-applied policy, so developers or > @@ -222,6 +223,9 @@ so if the ``ksm_rmap_items/ksm_merging_pages`` ratio exceeds 64 on 64-bit CPU > or exceeds 128 on 32-bit CPU, then the app's madvise policy should be dropped, > because the ksm profit is approximately zero or negative. > > +The ksm_merge_type in ``/proc/<pid>/ksm_stat`` shows the merge type of the > +process. Valid values are ``none``, ``madvise`` and ``process``. > + > Monitoring KSM events > ===================== > The change LGTM.
diff --git a/Documentation/admin-guide/mm/ksm.rst b/Documentation/admin-guide/mm/ksm.rst index 72189bf1283e..70896f01d641 100644 --- a/Documentation/admin-guide/mm/ksm.rst +++ b/Documentation/admin-guide/mm/ksm.rst @@ -211,7 +211,8 @@ several times, which are unprofitable memory consumed. ksm_rmap_items * sizeof(rmap_item). where ksm_merging_pages is shown under the directory ``/proc/<pid>/``, - and ksm_rmap_items is shown in ``/proc/<pid>/ksm_stat``. + and ksm_rmap_items is shown in ``/proc/<pid>/ksm_stat``. The process profit + is also shown in ``/proc/<pid>/ksm_stat`` as ksm_process_profit. From the perspective of application, a high ratio of ``ksm_rmap_items`` to ``ksm_merging_pages`` means a bad madvise-applied policy, so developers or @@ -222,6 +223,9 @@ so if the ``ksm_rmap_items/ksm_merging_pages`` ratio exceeds 64 on 64-bit CPU or exceeds 128 on 32-bit CPU, then the app's madvise policy should be dropped, because the ksm profit is approximately zero or negative. +The ksm_merge_type in ``/proc/<pid>/ksm_stat`` shows the merge type of the +process. Valid values are ``none``, ``madvise`` and ``process``. + Monitoring KSM events =====================
This documents the ksm_process_profit and ksm_merge_type settings in ksm_stat. Signed-off-by: Stefan Roesch <shr@devkernel.io> --- Documentation/admin-guide/mm/ksm.rst | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)