linux-kernel - Re: [PATCH] kernel/resource: optimize find_next_iomem

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Date: Fri, 31 May 2024 18:32:39 +0300
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Chia-I Wu <olvaffe@...il.com>
Cc: amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
	christian.koenig@....com, alexander.deucher@....com,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Alison Schofield <alison.schofield@...el.com>,
	Dave Jiang <dave.jiang@...el.com>, Baoquan He <bhe@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kernel/resource: optimize find_next_iomem_res

On Thu, May 30, 2024 at 10:36:57PM -0700, Chia-I Wu wrote:
> We can skip children resources when the parent resource does not cover
> the range.

> This should help vmf_insert_* users on x86, such as several DRM drivers.

vmf_insert_*()

> On my AMD Ryzen 5 7520C, when streaming data from cpu memory into amdgpu
> bo, the throughput goes from 5.1GB/s to 6.6GB/s.  perf report says

Also in the $Subj (and pay attention to the prefix)

"resource: ... find_next_iomem_res()"


-- 
With Best Regards,
Andy Shevchenko