linux-kernel - Re: [PATCH 1/2] ipc sem: use kvmalloc for sem

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Message-ID: <YIcioHGrtjFHoDej@carbon.dhcp.thefacebook.com>
Date:   Mon, 26 Apr 2021 13:29:20 -0700
From:   Roman Gushchin <guro@...com>
To:     Vasily Averin <vvs@...tuozzo.com>
CC:     Michal Hocko <mhocko@...e.com>, <cgroups@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Shakeel Butt <shakeelb@...gle.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dmitry Safonov <0x7f454c46@...il.com>
Subject: Re: [PATCH 1/2] ipc sem: use kvmalloc for sem_undo allocation

On Mon, Apr 26, 2021 at 01:18:09PM +0300, Vasily Averin wrote:
> size of sem_undo can exceed one page and with the maximum possible
> nsems = 32000 it can grow up to 64Kb. Let's switch its allocation
> to kvmalloc to avoid user-triggered disruptive actions like OOM killer
> in case of high-order memory shortage.
> 
> Signed-off-by: Vasily Averin <vvs@...tuozzo.com>

Acked-by: Roman Gushchin <guro@...com>