From: Cyrill Gorcunov <gorcunov@gmail.com>
To: Yang Shi <yang.shi@linux.alibaba.com>
Cc: Michal Hocko <mhocko@kernel.org>,
adobriyan@gmail.com, willy@infradead.org, mguzik@redhat.com,
akpm@linux-foundation.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Subject: Re: [v2 PATCH] mm: introduce arg_lock to protect arg_start|end and env_start|end in mm_struct
Date: Tue, 27 Mar 2018 21:52:17 +0300 [thread overview]
Message-ID: <20180327185217.GK2236@uranus> (raw)
In-Reply-To: <95a107ac-5e5b-92d7-dbde-2e961d85de28@linux.alibaba.com>
On Tue, Mar 27, 2018 at 02:38:11PM -0400, Yang Shi wrote:
> > Why do we need to hold mmap_sem here and call find_vma, when only
> > PR_SET_MM_ENV_END: is consuming it? I guess we can replace it wit the
> > new lock and take the mmap_sem only for PR_SET_MM_ENV_END.
>
> Actually, I didn't think of why. It looks prctl_set_mm() checks if vma does
> exist when it tries to set stack_start, argv_* and env_*, btw not only
> env_end.
>
> Cyrill may be able to give us some hint since C/R is the main user of this
> API.
First and most important it makes code smaller. This prctl call is really
rarely used. Of course we can optimize it, but as I said I would prefer
to simply deprecate this old interface (and I gonne to do so once time
permit).
next prev parent reply other threads:[~2018-03-27 18:52 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-26 18:20 [v2 PATCH] mm: introduce arg_lock to protect arg_start|end and env_start|end in mm_struct Yang Shi
2018-03-26 18:37 ` Matthew Wilcox
2018-03-26 19:21 ` Cyrill Gorcunov
2018-03-26 21:10 ` Tetsuo Handa
2018-03-26 21:20 ` Yang Shi
2018-03-26 21:29 ` Cyrill Gorcunov
2018-03-26 22:00 ` Tetsuo Handa
2018-03-26 22:12 ` Yang Shi
2018-03-27 7:38 ` Cyrill Gorcunov
2018-03-27 7:37 ` Cyrill Gorcunov
2018-03-26 21:59 ` Yang Shi
2018-03-27 7:32 ` Cyrill Gorcunov
2018-03-27 18:44 ` Yang Shi
2018-03-26 19:42 ` Mateusz Guzik
2018-03-26 21:10 ` Yang Shi
2018-03-27 6:29 ` Michal Hocko
2018-03-27 14:31 ` Mateusz Guzik
2018-03-27 14:43 ` Michal Hocko
2018-03-27 18:38 ` Yang Shi
2018-03-27 18:52 ` Cyrill Gorcunov [this message]
2018-03-28 13:10 ` Michal Hocko
2018-04-02 1:58 ` Yang Shi
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