Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
MIME-Version: 1.0
References: <156213869409.3910140.7715747316991468148.stgit@dwillia2-desk3.amr.corp.intel.com>
 <20190703121743.GH1729@bombadil.infradead.org>
In-Reply-To: <20190703121743.GH1729@bombadil.infradead.org>
From:   Dan Williams <dan.j.williams@intel.com>
Date:   Wed, 3 Jul 2019 10:01:37 -0700
Message-ID: <CAPcyv4jgs5LTtTXR+2CyfbjJE85B_eoPFuXQsGBDnVMo41Jawg@mail.gmail.com>
Subject: Re: [PATCH] dax: Fix missed PMD wakeups
To:     Matthew Wilcox <willy@infradead.org>
Cc:     linux-fsdevel <linux-fsdevel@vger.kernel.org>,
        Jan Kara <jack@suse.cz>, Boaz Harrosh <openosd@gmail.com>,
        stable <stable@vger.kernel.org>,
        Robert Barror <robert.barror@intel.com>,
        Seema Pandit <seema.pandit@intel.com>,
        linux-nvdimm <linux-nvdimm@lists.01.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Content-Type: text/plain; charset="UTF-8"
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Wed, Jul 3, 2019 at 5:17 AM Matthew Wilcox <willy@infradead.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.