linux-kernel - Re: [PATCH 1/1] psi: remove 500ms min window size limitation for triggers

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Message-ID: <ZADf27Kx5mbFev+I@dhcp22.suse.cz>
Date:   Thu, 2 Mar 2023 18:41:47 +0100
From:   Michal Hocko <mhocko@...e.com>
To:     Suren Baghdasaryan <surenb@...gle.com>
Cc:     Johannes Weiner <hannes@...xchg.org>, tj@...nel.org,
        lizefan.x@...edance.com, peterz@...radead.org, johunt@...mai.com,
        keescook@...omium.org, quic_sudaraja@...cinc.com,
        cgroups@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] psi: remove 500ms min window size limitation for
 triggers

On Thu 02-03-23 08:13:54, Suren Baghdasaryan wrote:
[...]
> Let's roll this check without additional changes and then consolidate
> the checking inside psi_trigger_create() in a separate patch. If
> anybody objects to the late permission check we will just revert that
> last change without affecting anything else.

Permissions checks at write time are problematic because userspace
cannot drop privileges. Also I think it would be an antipattern for how
we do this in general. 
-- 
Michal Hocko
SUSE Labs