linux-kernel - Re: Report: Performance regression from ib_umem

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Message-ID: <a789c1c6-7bd5-4cc9-bc8e-c70715b09932@oracle.com>
Date: Wed, 23 Apr 2025 20:00:39 -0700
From: jane.chu@...cle.com
To: Jason Gunthorpe <jgg@...pe.ca>
Cc: logane@...tatee.com, hch@....de, gregkh@...uxfoundation.org,
        willy@...radead.org, kch@...dia.com, axboe@...nel.dk,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-pci@...r.kernel.org, linux-nvme@...ts.infradead.org,
        linux-block@...r.kernel.org
Subject: Re: Report: Performance regression from ib_umem_get on zone device
 pages


On 4/23/2025 7:55 PM, jane.chu@...cle.com wrote:
> 
> On 4/23/2025 4:28 PM, Jason Gunthorpe wrote:
>> IIRC device-dax does could not use folios until 6.15 so I'm assuming
>> it is not folios even if it is a pmd mapping?
> 
> I just looked at 6.15-rc3, device-dax is not using folio. Maybe I'm 
> missing some upcoming patches?

Oops, scratch that.  I'll test 6.15.

thanks,
-jane
> 
> thanks,
> -jane
> 
>