linux-kernel - Re: [PATCH v4 6/6] alloc_tag: support for page allocation tag compression

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Message-ID: <CAJuCfpHFLeYb2Za42=Yp-SxWK-cO-A3N-cOiEY9VV3XUp9kEYA@mail.gmail.com>
Date: Wed, 23 Oct 2024 20:48:11 -0700
From: Suren Baghdasaryan <surenb@...gle.com>
To: Pasha Tatashin <pasha.tatashin@...een.com>
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Subject: Re: [PATCH v4 6/6] alloc_tag: support for page allocation tag compression

On Wed, Oct 23, 2024 at 11:30 AM Pasha Tatashin
<pasha.tatashin@...een.com> wrote:
>
> On Wed, Oct 23, 2024 at 1:08 PM Suren Baghdasaryan <surenb@...gle.com> wrote:
> >
> > Implement support for storing page allocation tag references directly
> > in the page flags instead of page extensions. sysctl.vm.mem_profiling
> > boot parameter it extended to provide a way for a user to request this
> > mode. Enabling compression eliminates memory overhead caused by page_ext
> > and results in better performance for page allocations. However this
> > mode will not work if the number of available page flag bits is
> > insufficient to address all kernel allocations. Such condition can
> > happen during boot or when loading a module. If this condition is
> > detected, memory allocation profiling gets disabled with an appropriate
> > warning. By default compression mode is disabled.
> >
> > Signed-off-by: Suren Baghdasaryan <surenb@...gle.com>
>
> Thank you very much Suren for doing this work. This is a very
> significant improvement for the fleet users.
>
> Reviewed-by: Pasha Tatashin <pasha.tatashin@...een.com>

Thank you for the reviews and I'm glad it's useful for others as well!