linux-kernel - Re: [PATCH v2 18/18] lib/stackdepot: move documentation comments to stackdepot.h

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Message-ID: <CAG_fn=XEP2ETd5c8Pz2Eri2mHpDzewnBLWoQC=_Z3VKke9w_0g@mail.gmail.com>
Date:   Mon, 13 Feb 2023 14:27:22 +0100
From:   Alexander Potapenko <glider@...gle.com>
To:     andrey.konovalov@...ux.dev
Cc:     Marco Elver <elver@...gle.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Vlastimil Babka <vbabka@...e.cz>, kasan-dev@...glegroups.com,
        Evgenii Stepanov <eugenis@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Andrey Konovalov <andreyknvl@...gle.com>
Subject: Re: [PATCH v2 18/18] lib/stackdepot: move documentation comments to stackdepot.h

On Fri, Feb 10, 2023 at 10:19 PM <andrey.konovalov@...ux.dev> wrote:
>
> From: Andrey Konovalov <andreyknvl@...gle.com>
>
> Move all interface- and usage-related documentation comments to
> include/linux/stackdepot.h.
>
> It makes sense to have them in the header where they are available to
> the interface users.
>
> Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
Reviewed-by: Alexander Potapenko <glider@...gle.com>

> + * For example, KASAN needs to save allocation and free stack traces for each
> + * object. Storing two stack traces per object requires a lot of memory (e.g.
> + * SLUB_DEBUG needs 256 bytes per object for that). Since allocation and free
> + * stack traces often repeat, using stack depot allows to save about 100x space.
> + *
> + * Stack traces are never removed from stack depot.
... from the stack depot?