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[31.46.243.128]) by smtp.gmail.com with ESMTPSA id x11-20020a170906b08b00b007806c1474e1sm16297503ejy.127.2023.01.05.02.48.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 05 Jan 2023 02:48:15 -0800 (PST) Date: Thu, 5 Jan 2023 11:48:13 +0100 From: Ingo Molnar To: Aaron Thompson Cc: Mike Rapoport , linux-mm@kvack.org, "H. Peter Anvin" , Alexander Potapenko , Andrew Morton , Andy Shevchenko , Ard Biesheuvel , Borislav Petkov , Darren Hart , Dave Hansen , David Rientjes , Dmitry Vyukov , Ingo Molnar , Marco Elver , Thomas Gleixner , kasan-dev@googlegroups.com, linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org, platform-driver-x86@vger.kernel.org, x86@kernel.org Subject: Re: [PATCH v2 1/1] mm: Always release pages to the buddy allocator in memblock_free_late(). Message-ID: References: <010101857bbc3a41-173240b3-9064-42ef-93f3-482081126ec2-000000@us-west-2.amazonses.com> <20230105041650.1485-1-dev@aaront.org> <010001858025fc22-e619988e-c0a5-4545-bd93-783890b9ad14-000000@email.amazonses.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <010001858025fc22-e619988e-c0a5-4545-bd93-783890b9ad14-000000@email.amazonses.com> X-Rspam-User: X-Rspamd-Queue-Id: 102BB1A000B X-Rspamd-Server: rspam01 X-Stat-Signature: h981hjhomtnaz3a4ncdar4xms7yasbga X-HE-Tag: 1672915697-474516 X-HE-Meta: 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 Bot9A0PC cYQUxUkwwYuI98JhwYPMkxsdLycZPt6uvzRyOawS+x+OSow0/nstORaCoRsiSFwd6BV+C5miFY4kU8T7I4YWpcODVq2WYDK9qmSxQ84NIOukcxRUgpLd734pW5WzXwUsv3oK3foMojx6DJiNvtxkZXK/28WFSiWR+Dl7ypnwM2PYqNDT15FhGgzER4ZyjjDlfoUXv1abNAYvvdr6w1SIWtnSe130T1ql2NWRNgv7xV88DxiQD2KsdaeDskSKLj/bD/VzcEg2sgEATzNMAi42c+UZHlsq/4ojBVRah3vyObdn+Xi4hZuAHOHaFkwVCSEMRLyoMMX6RSSfZRLnnkms2VE1FskGW1ApPtIj6 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: * Aaron Thompson wrote: > For example, on an Amazon EC2 t3.micro VM (1 GB) booting via EFI: > > v6.2-rc2: > # grep -E 'Node|spanned|present|managed' /proc/zoneinfo > Node 0, zone DMA > spanned 4095 > present 3999 > managed 3840 > Node 0, zone DMA32 > spanned 246652 > present 245868 > managed 178867 > > v6.2-rc2 + patch: > # grep -E 'Node|spanned|present|managed' /proc/zoneinfo > Node 0, zone DMA > spanned 4095 > present 3999 > managed 3840 > Node 0, zone DMA32 > spanned 246652 > present 245868 > managed 222816 # +43,949 pages [ Note the annotation I added to the output - might be useful in the changelog too. ] So this patch adds around +17% of RAM to this 1 GB virtual system? That looks rather significant ... Thanks, Ingo