linux-kernel - Re: [PATCH v4 15/36] lib: introduce support for page allocation tagging

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Message-ID: <CAJuCfpGZ6W-vjby=hWd5F3BOCLjdeda2iQx_Tz-HcyjCAsmKVg@mail.gmail.com>
Date: Mon, 26 Feb 2024 09:11:45 -0800
From: Suren Baghdasaryan <surenb@...gle.com>
To: Vlastimil Babka <vbabka@...e.cz>
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Subject: Re: [PATCH v4 15/36] lib: introduce support for page allocation tagging

On Mon, Feb 26, 2024 at 9:07 AM Vlastimil Babka <vbabka@...e.cz> wrote:
>
> On 2/21/24 20:40, Suren Baghdasaryan wrote:
> > Introduce helper functions to easily instrument page allocators by
> > storing a pointer to the allocation tag associated with the code that
> > allocated the page in a page_ext field.
> >
> > Signed-off-by: Suren Baghdasaryan <surenb@...gle.com>
> > Co-developed-by: Kent Overstreet <kent.overstreet@...ux.dev>
> > Signed-off-by: Kent Overstreet <kent.overstreet@...ux.dev>
>
> The static key usage seems fine now. Even if the page_ext overhead is still
> always paid when compiled in, you mention in the cover letter there's a plan
> for boot-time toggle later, so

Yes, I already have a simple patch for that to be included in the next
revision: https://github.com/torvalds/linux/commit/7ca367e80232345f471b77b3ea71cf82faf50954

>
> Reviewed-by: Vlastimil Babka <vbabka@...e.cz>

Thanks!

>
>