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b=Zix5f4AeG0b26CGKytIaRSw6ZEc3BYP6FNOflQjshf6oQ3fBYtCcKvD418n2O4idD VkC/KPqEkvzykEwu922IObYnxERDc7XkUgobdi8UU/njPjCnkOeMYsps1ZutSRPHjC NglNsTidAbDJJpEd+mFmX4esNqh/qJDQs5Iscg94kEYA9TK7o3+hcpNKOXI3l2uXHE uosyFJHk1JYglJomqxSnJlTghv5bHaGCcCFZlaG0/KesU7nluOqQeCvyb7UueHTHgb o78V8/RjkWyjJux2U3iC9Dlb0a8P9ffNnfw3DyjkFsxHxmgQ/jPHwLIp72Av380LX6 yNYLu/4sTdw/A== Message-ID: <1fc0caa5-43b1-487f-94cf-0d1aff4c03fd@kernel.org> Date: Thu, 29 Oct 2026 10:59:33 +0100 X-Archived-By: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/2] mm: page_alloc: do not give all non-blocking requests reserve access Content-Language: en-US To: Andrew Morton , Christoph Hellwig Cc: Salvatore Dipietro , hannes@cmpxchg.org, abuehaze@amazon.com, alisaidi@amazon.com, blakgeof@amazon.com, brauner@kernel.org, brendan.jackman@linux.dev, david@redhat.com, dgc@kernel.org, dipietro.salvatore@gmail.com, djwong@kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-xfs@vger.kernel.org, matt@readmodwrite.com, mhocko@suse.com, ritesh.list@gmail.com, rvvandan@amazon.com, stable@vger.kernel.org, surenb@google.com, willy@infradead.org, ziy@nvidia.com References: <20261027150002.318916-1-dipiets@amazon.it> <20261028144148.GA14023@lst.de> <20261028225517.75e13881be22461a8c94e07d@linux-foundation.org> From: "Vlastimil Babka (SUSE)" Autocrypt: addr=vbabka@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 874F210000D X-Stat-Signature: aa6r8ifqyewg5u1ikwed7akoxeqzygu1 X-Rspamd-Server: rspam04 X-Spam-Status: No, score=-7.3 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_PASS,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=4.0.1 X-Rspam-User: X-HE-Tag: 1793267981-993223 X-HE-Meta: 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 Jv8qMBVX OJLMZmC13ZO9EodGZ0cYWyQYvCcCL6fcM6nKxGY/F+ZXSpazQSoDJrGssfGaDykWly+moz+DcZ75P5DBQa//wobEMHW5O2GaggGbOIrw+Mk1HCHz9a9Q9ojFUM5uGA72BYuN2EWhoYY4lwhBZtzfTSD6bpCHKd8ccQhUopSUjMDdjOb0skHFo4ew2C5D8y631T//aqtcnz8PUEe+agCf3rUfVShADTCYSI+TSk4wxY7/6oI/GWxbcfLokko1PNqUeoODIM/IVJCmXDKD806VR0pszvT+F3vU93REl0PXWb9RrbdfDSNuGhsnY8cexWlAGZPq5yRMIAQ45i852k1PPxPLQBbGKYrPJp8rSCJR6SmeDFX6O1/ErOngmrFku9b8mrxU+tK38okKlM4kewOiN5TRIuw== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On 10/29/26 06:55, Andrew Morton wrote: > On Wed, 28 Oct 2026 15:41:48 +0100 Christoph Hellwig wrote: > >> On Tue, Oct 27, 2026 at 03:00:02PM +0000, Salvatore Dipietro wrote: >> > >> > Hi Johannes, >> > >> > Vlastimil asked that v6 of my page_alloc patch [1] not go to mainline >> > before these two patches land, so Andrew parked v6 at the tail of >> > mm-unstable and dropped its Cc: stable until then. >> > >> > Are you still planning to work on 1/2 and 2/2, and if so, do you have >> > a rough ETA? Or would you rather post them as a separate series as >> > they are? If anything is needed on my side to move them forward, I'm >> > happy to help. >> > >> > For what it's worth, I ran both stacked under v6 on v7.3-rc1 and saw >> > no performance difference on my benchmark with or without them. >> >> It would be really important to get some fix for this into 7.3. >> We can still perfect it later. > > What is "this"? You're referring to the performance regression which > Salvatore's "mm/page_alloc: avoid direct reclaim and compaction for > costly __GFP_NORETRY allocations" addresses? > > In > https://lore.kernel.org/all/9f415dc7-adad-4161-b20d-7c3173f50ff3@kernel.org/ > vbabka indicated that Fixes: 281dd25c1a01 is needed on that patch. The "that patch" being Johannes's and the v2 you picked up has it > patch I'm sitting on (below) has Fixes: 5d8edfb900d5. Please clarify. It's correct. > In > https://lore.kernel.org/all/c6e2c1e1-a285-406e-a2b6-c09e05df91d8@kernel.org/ > vbabka argued that Salvatore's "mm/page_alloc: avoid direct reclaim and > compaction for costly __GFP_NORETRY allocations" should be a 7.4 thing. > > So it's all clear as mud. Can people please clarify? > > I have hannes's series "mm: page_alloc: fix reserve access for > non-blocking requests, v2" in mm-hotfixes, planned for 7.4-rcX. > > Should I move Salvatore's "mm/page_alloc: avoid direct reclaim and > compaction for costly __GFP_NORETRY allocations, v6" into mm-hotfixes > also, and restore its cc:stable? > > My vote: "yes" - that's a pretty obnoxious perf regression. Yes please.