linux-kernel - Re: [PATCH 2/3] mm/filemap: initiate readahead even if IOCB

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Message-ID: <nycvar.YFH.7.76.1901311306570.3281@cbobk.fhfr.pm>
Date:   Thu, 31 Jan 2019 13:08:00 +0100 (CET)
From:   Jiri Kosina <jikos@...nel.org>
To:     Daniel Gruss <daniel@...ss.cc>
cc:     Vlastimil Babka <vbabka@...e.cz>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-api@...r.kernel.org, Peter Zijlstra <peterz@...radead.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Jann Horn <jannh@...gle.com>,
        Dominique Martinet <asmadeus@...ewreck.org>,
        Andy Lutomirski <luto@...capital.net>,
        Dave Chinner <david@...morbit.com>,
        Kevin Easton <kevin@...rana.org>,
        Matthew Wilcox <willy@...radead.org>,
        Cyril Hrubis <chrubis@...e.cz>, Tejun Heo <tj@...nel.org>,
        "Kirill A . Shutemov" <kirill@...temov.name>
Subject: Re: [PATCH 2/3] mm/filemap: initiate readahead even if IOCB_NOWAIT
 is set for the I/O

On Thu, 31 Jan 2019, Daniel Gruss wrote:

> If I understood it correctly, this patch just removes the advantages of 
> preadv2 over mmmap+access for the attacker.

Which is the desired effect. We are not trying to solve the timing aspect, 
as I don't think there is a reasonable way to do it, is there?

-- 
Jiri Kosina
SUSE Labs