linux-kernel - Re: [PATCH v2 15/19] lib/stackdepot: add refcount for records

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Message-ID: <CAG_fn=WLgOq_dAK7pHro0DkyaLY7juCyHhLgKwxbbwUp=qgOKw@mail.gmail.com>
Date:   Mon, 9 Oct 2023 13:40:45 +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 15/19] lib/stackdepot: add refcount for records

On Wed, Sep 13, 2023 at 7:17 PM <andrey.konovalov@...ux.dev> wrote:
>
> From: Andrey Konovalov <andreyknvl@...gle.com>
>
> Add a reference counter for how many times a stack records has been added
> to stack depot.
>
> Add a new STACK_DEPOT_FLAG_GET flag to stack_depot_save_flags that
> instructs the stack depot to increment the refcount.
>
> Do not yet decrement the refcount; this is implemented in one of the
> following patches.
>
> Do not yet enable any users to use the flag to avoid overflowing the
> refcount.
>
> 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>