Messages in this thread | | | Date | Mon, 20 Jun 2022 10:15:19 +0200 | From | Vincent Whitchurch <> | Subject | Re: [PATCH v2] mm/smaps: add Pss_Dirty |
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On Mon, Jun 20, 2022 at 10:12:50AM +0200, Vincent Whitchurch wrote: > Pss is the sum of the sizes of clean and dirty private pages, and the > proportional sizes of clean and dirty shared pages: > > Private = Private_Dirty + Private_Clean > Shared_Proportional = Shared_Dirty_Proportional + Shared_Clean_Proportional > Pss = Private + Shared_Proportional > > The Shared*Proportional fields are not present in smaps, so it is not > always possible to determine how much of the Pss is from dirty pages and > how much is from clean pages. This information can be useful for > measuring memory usage for the purpose of optimisation, since clean > pages can usually be discarded by the kernel immediately while dirty > pages cannot. > > The smaps routines in the kernel already have access to this data, so > add a Pss_Dirty to show it to userspace. Pss_Clean is not added since > it can be calculated from Pss and Pss_Dirty. > > Signed-off-by: Vincent Whitchurch <vincent.whitchurch@axis.com> > ---
I forgot to include the changelog:
v2: - Update Documentation/ABI/testing/procfs-smaps_rollup and Documentation/filesystems/proc.rst. - Move Pss_Dirty next to Pss so that the location is consistent between non-rollup and rollup (since the later has some extra Pss* fields).
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