linux-kernel - Re: [PATCH] filesystem-dax: Disable PMD support

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Message-ID: <1eac7cfb-a23c-097e-8dba-d83e6921f152@gmail.com>
Date:   Wed, 3 Jul 2019 04:39:38 +0300
From:   Boaz Harrosh <openosd@...il.com>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     Matthew Wilcox <willy@...radead.org>,
        Seema Pandit <seema.pandit@...el.com>,
        linux-nvdimm <linux-nvdimm@...ts.01.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        stable <stable@...r.kernel.org>,
        Robert Barror <robert.barror@...el.com>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Jan Kara <jack@...e.cz>
Subject: Re: [PATCH] filesystem-dax: Disable PMD support

On 03/07/2019 03:42, Dan Williams wrote:
> On Tue, Jul 2, 2019 at 5:23 PM Boaz Harrosh <openosd@...il.com> wrote:
<>
> 
> Yes, but the trick is how to manage cases where someone waiting on one
> type needs to be woken up by an event on the other. 

Exactly I'm totally with you on this.

> So all I'm saying it lets live with more hash collisions until we can figure out a race
> free way to better scale waitqueue usage.
> 

Yes and lets actually do real measurements to see if this really hurts needlessly.
Maybe not so much

Thanks
Boaz

<>