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b=DMldx9tg+HdYwfuQQxRWzBc7wyw1rnti/NG9wDkQFNaoq4tlbXOg+L6PTiky8iar2 mRGOTL1D7xofBsoaEpp7coe8KJKxI7wBNIK2wNFEsNr3lMs7P9HrmUkeZCZKwQRwAB fLkITnxhqGomddh2Ed9jNN4DD2rhtdX2iUqEqDRQ= Date: Mon, 27 Jan 2025 13:20:08 -0800 From: Andrew Morton To: yangge1116@126.com Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, 21cnbao@gmail.com, david@redhat.com, baolin.wang@linux.alibaba.com, hannes@cmpxchg.org, vbabka@suse.cz, liuzixing@hygon.cn Subject: Re: [PATCH V4] mm: compaction: use the proper flag to determine watermarks Message-Id: <20250127132008.917711e60d76d334cbde8525@linux-foundation.org> In-Reply-To: <1737788037-8439-1-git-send-email-yangge1116@126.com> References: <1737788037-8439-1-git-send-email-yangge1116@126.com> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: EF4C91C0004 X-Stat-Signature: 3z644dqcgkmmo7qd7yga6tez9ckmbn5y X-HE-Tag: 1738012810-170934 X-HE-Meta: U2FsdGVkX1+5OZ8iDh9qAc94D5OB/hX6A2Ht29ffauni+uCwTXnv5R1KfZ2tQUtzNKI+9UTViyZueiNjFT8Lss+5Vabyr+6qjMuNMoh4x45XR7kuoRqyoAwQNeqMMbRcughmYpHliDyAOVML14cXHagPWXzqSkl3SAx8jWhiZazR7/KGnhtq6KrxRqpem9YKVZ7VB1/ERXggh50Z1it+Jjl0dEz3bQOyPf29zOJMDQUwlRgOPH6vjnCS8IDXzRla9dVhZgp3/kkZxhyanC5dhdX2eM4t1DGoeH9mqVk7SXl5zJjR9UjtwcFxajmQI/HBMKZnJv6sM4u8nosg88WO+Ikj+ULLQYZeMzxpBb52o3x+Th0bMfLZktMGNm+x6OsYf3pWXv5+qeBtDHNa5i9aKfMCo/D4yPlB9OFy4X8H2mFtg5eMXUOLxB9ncrE9GKZe70TDhDcFykg1jmrvYxzOXEd1gynxKqMnWw1lFH057yq+zRO5S0esvnNh7M1faUQ5fo/0GfHZcWYgoVfvdOZDDMpnI0vGWini419hnCEi4Y+MIhIgrRJ/pLESPX0jYu2O6N2vzI4nk5jUQQMOaJ0HhhbaOP8RttEph/8eA2kr5Osv/J+dGRWa4/EbLMZmfx+uV4Rn9kqIoZBf3xFLHxFG3k0dj+eDs608Sh6jemNk321y7yY7WLk0/kIXnsILXz1woQx1dMOjBa+k4GSNxrElrd51VaQrvR9tHdB95SR0QNYmMOceJ0o78UCRryibLU7xC3b4cCLMv2TYf6AFO9HICse0OnLp/2IVjiuLtH9i1dFzXJeYfFwTBm8iVYL3gtoYPzICDcLWa4n9bcJKWQl63RTqaaH3QizJ3MXYhANWRrlGg8kYo/0ekO+rZMIS/JWOVGcqUvMQSqWIfdi8Q+iSAoMI3O72uWr+TD2j/FySJQAW4qmF0t8K2lMOXIvoQyUA8TRCix2O/xrDMnaqn/B roQvqdmW JQ9QiiSSxEZn7GDjb3yHzA2g/vvqloe4AJT2ybzzHLp1eBZ41b3OOvy4hgy7iCwvUIr/yFEBP9Nb3YL4McXcZhSvnoYAgUfALmFeXSVHBO3IosH/R/s3B50vzSYAtJ8DLvQnigsU3ScNTicQPrs86Qb/kQzPI+x1ICPs2Gs6eD8qGGmP8QOmkrVcc7P7eJfkGofdldE18L2kkpjFi4q4u5nh2N4KM9yxTn+RCZx1g3XhjvWEb2nadrZ85VnzbXqsfkCMNchKpPBq2GkrLiyB4YeRPO3LEfjiq35m0dFllHxYFBBYStZvI8/PLRw== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000006, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Sat, 25 Jan 2025 14:53:57 +0800 yangge1116@126.com wrote: > From: yangge > > 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.