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

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Message-ID: <20250429122956.GB2260621@ziepe.ca>
Date: Tue, 29 Apr 2025 09:29:56 -0300
From: Jason Gunthorpe <jgg@...pe.ca>
To: jane.chu@...cle.com
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 Mon, Apr 28, 2025 at 12:11:40PM -0700, jane.chu@...cle.com wrote:

> 6.15-rc3 is orders of magnitude better.
> Agreed that device-dax's using folio are likely the heros. I've yet to check
> the code and bisect, maybe pin_user_page_fast() adds folios to page_list[]
> instead of 4K pages?

It does not.

I think a bisection would be interesting information

Jason