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Message-Id: <20250127132008.917711e60d76d334cbde8525@linux-foundation.org>
Date: Mon, 27 Jan 2025 13:20:08 -0800
From: Andrew Morton <akpm@...ux-foundation.org>
To: yangge1116@....com
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org, 21cnbao@...il.com,
 david@...hat.com, baolin.wang@...ux.alibaba.com, hannes@...xchg.org,
 vbabka@...e.cz, liuzixing@...on.cn
Subject: Re: [PATCH V4] mm: compaction: use the proper flag to determine
 watermarks

On Sat, 25 Jan 2025 14:53:57 +0800 yangge1116@....com wrote:

> From: yangge <yangge1116@....com>
> 
> There are 4 NUMA nodes on my machine, and each NUMA node has 32GB
> of memory. I have configured 16GB of CMA memory on each NUMA node,
> and starting a 32GB virtual machine with device passthrough is
> extremely slow, taking almost an hour.
>
> ...
>
> After this fix, it only takes a few tens of seconds to start a 32GB
> virtual machine with device passthrough functionality.

An hour is unacceptable - I'll add cc:stable to this.

If this is a regression then a Link: tag would be nice.  Or perhaps the
kernel had always done this.


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