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From:   Alexander Potapenko <glider@google.com>
Date:   Mon, 9 Oct 2023 13:40:45 +0200
Message-ID: <CAG_fn=WLgOq_dAK7pHro0DkyaLY7juCyHhLgKwxbbwUp=qgOKw@mail.gmail.com>
Subject: Re: [PATCH v2 15/19] lib/stackdepot: add refcount for records
To:     andrey.konovalov@linux.dev
Cc:     Marco Elver <elver@google.com>,
        Andrey Konovalov <andreyknvl@gmail.com>,
        Dmitry Vyukov <dvyukov@google.com>,
        Vlastimil Babka <vbabka@suse.cz>, kasan-dev@googlegroups.com,
        Evgenii Stepanov <eugenis@google.com>,
        Oscar Salvador <osalvador@suse.de>,
        Andrew Morton <akpm@linux-foundation.org>, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org,
        Andrey Konovalov <andreyknvl@google.com>
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On Wed, Sep 13, 2023 at 7:17=E2=80=AFPM <andrey.konovalov@linux.dev> wrote:
>
> From: Andrey Konovalov <andreyknvl@google.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@google.com>
Reviewed-by: Alexander Potapenko <glider@google.com>