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

[Suren Baghdasaryan]

On Wed, Oct 23, 2024 at 11:30 AM Pasha Tatashin
<pasha.tatashin@xxxxxxxxxx> wrote:
>
> On Wed, Oct 23, 2024 at 1:08 PM Suren Baghdasaryan <surenb@xxxxxxxxxx> 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@xxxxxxxxxx>
>
> 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@xxxxxxxxxx>

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