linux-kernel - Re: [RFC PATCH 29/37] fs: list file types that support speculative faults.

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Message-ID: <20210407023944.GZ2531743@casper.infradead.org>
Date:   Wed, 7 Apr 2021 03:39:44 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Michel Lespinasse <michel@...pinasse.org>
Cc:     Linux-MM <linux-mm@...ck.org>,
        Laurent Dufour <ldufour@...ux.ibm.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Michal Hocko <mhocko@...e.com>,
        Rik van Riel <riel@...riel.com>,
        Paul McKenney <paulmck@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Joel Fernandes <joelaf@...gle.com>,
        Rom Lemarchand <romlem@...gle.com>,
        Linux-Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 29/37] fs: list file types that support speculative
 faults.

On Tue, Apr 06, 2021 at 06:44:54PM -0700, Michel Lespinasse wrote:
> Add a speculative field to the vm_operations_struct, which indicates if
> the associated file type supports speculative faults.
> 
> Initially this is set for files that implement fault() with filemap_fault().

Ugh, no.  This goes away if you don't call ->fault speculatively.