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

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Message-ID: <CA+CK2bBzZDdVN66qK4UQ4jpDuAABu89S3mVNbJipaJjL3bcg4w@mail.gmail.com>
Date: Wed, 23 Oct 2024 14:29:51 -0400
From: Pasha Tatashin <pasha.tatashin@...een.com>
To: Suren Baghdasaryan <surenb@...gle.com>
Cc: akpm@...ux-foundation.org, kent.overstreet@...ux.dev, corbet@....net, 
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Subject: Re: [PATCH v4 6/6] alloc_tag: support for page allocation tag compression

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>