linux-kernel - Re: [PATCH v2 10/19] lib/stackdepot: store free stack records in a freelist

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Message-ID: <CAG_fn=V13PRuq873BgkfP9oSd=_0VAeyxNJtbpZOzQvQNxCEQg@mail.gmail.com>
Date:   Mon, 9 Oct 2023 11:32:21 +0200
From:   Alexander Potapenko <glider@...gle.com>
To:     andrey.konovalov@...ux.dev
Cc:     Marco Elver <elver@...gle.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Vlastimil Babka <vbabka@...e.cz>, kasan-dev@...glegroups.com,
        Evgenii Stepanov <eugenis@...gle.com>,
        Oscar Salvador <osalvador@...e.de>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Andrey Konovalov <andreyknvl@...gle.com>
Subject: Re: [PATCH v2 10/19] lib/stackdepot: store free stack records in a freelist

On Wed, Sep 13, 2023 at 7:15 PM <andrey.konovalov@...ux.dev> wrote:
>
> From: Andrey Konovalov <andreyknvl@...gle.com>
>
> Instead of using the global pool_offset variable to find a free slot
> when storing a new stack record, mainlain a freelist of free slots
> within the allocated stack pools.
>
> A global next_stack variable is used as the head of the freelist, and
> the next field in the stack_record struct is reused as freelist link
> (when the record is not in the freelist, this field is used as a link
> in the hash table).
>
> This is preparatory patch for implementing the eviction of stack records
> from the stack depot.
>
> Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
Reviewed-by: Alexander Potapenko <glider@...gle.com>