linux-kernel - Re: [PATCH] dax: Fix missed PMD wakeups

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Date:   Wed, 3 Jul 2019 10:01:37 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Jan Kara <jack@...e.cz>, Boaz Harrosh <openosd@...il.com>,
        stable <stable@...r.kernel.org>,
        Robert Barror <robert.barror@...el.com>,
        Seema Pandit <seema.pandit@...el.com>,
        linux-nvdimm <linux-nvdimm@...ts.01.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] dax: Fix missed PMD wakeups

On Wed, Jul 3, 2019 at 5:17 AM Matthew Wilcox <willy@...radead.org> wrote:
>
> On Wed, Jul 03, 2019 at 12:24:54AM -0700, Dan Williams wrote:
> > This fix may increase waitqueue contention, but a fix for that is saved
> > for a larger rework. In the meantime this fix is suitable for -stable
> > backports.
>
> I think this is too big for what it is; just the two-line patch to stop
> incorporating the low bits of the PTE would be more appropriate.

Sufficient, yes, "appropriate", not so sure. All those comments about
pmd entry size are stale after this change.