linux-kernel - Re: [PATCH 1/6] mm: make mm->pinned

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Message-ID: <010001687265e644-49af6f45-e29b-41a7-9cd4-50ff8d64b9f9-000000@email.amazonses.com>
Date:   Mon, 21 Jan 2019 21:51:47 +0000
From:   Christopher Lameter <cl@...ux.com>
To:     Davidlohr Bueso <dave@...olabs.net>
cc:     akpm@...ux-foundation.org, dledford@...hat.com, jgg@...lanox.com,
        jack@...e.de, ira.weiny@...el.com, linux-rdma@...r.kernel.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Davidlohr Bueso <dbueso@...e.de>
Subject: Re: [PATCH 1/6] mm: make mm->pinned_vm an atomic64 counter

On Mon, 21 Jan 2019, Davidlohr Bueso wrote
> Taking a sleeping lock to _only_ increment a variable is quite the
> overkill, and pretty much all users do this. Furthermore, some drivers
> (ie: infiniband and scif) that need pinned semantics can go to quite
> some trouble to actually delay via workqueue (un)accounting for pinned
> pages when not possible to acquire it.

Reviewed-by: Christoph Lameter <cl@...ux.com>