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

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Message-ID: <d6141a99-3409-447b-88ac-16c24b0a892e@suse.cz>
Date: Mon, 26 Feb 2024 18:07:53 +0100
From: Vlastimil Babka <vbabka@...e.cz>
To: Suren Baghdasaryan <surenb@...gle.com>, akpm@...ux-foundation.org
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Subject: Re: [PATCH v4 15/36] lib: introduce support for page allocation
 tagging

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

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