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b=n/X0ysJgGorfmYgEiZVy+KEk7r6M/3QuiWxeWtzAVZD/cMvm3TLiBMZpjiN3SleAE Sf1UK4H6N5Omk+0koIpzJafqSrBuQoXqGF+uwumXsvwQ2KvTiLq1Oku4vx+ABRCWR9 IGEMLlGxtXnceyBrT0/IbrHs0bMYQCv+aztMpIZ9ybcY6CTguZ7Boz+J3nPiY1qlER R3rFTuFOy0GDjkOh70F32zl9MQJjwz50RLoNeIoDp7HETooyrVeO1FIl+Q0yy0vROw T0RMbGP7PKbeDZZv7Dkf6WOCTo6HGnkOwXwBLO6oHZACzx1mbG0P4ny0p7p1ZV2zUQ mpXtJOrJOoFmA== Message-ID: Date: Fri, 26 Jun 2026 13:08:25 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3] mm/slub: deduplicate NUMA policy calculation in allocation paths Content-Language: en-US To: Hao Li , harry@kernel.org Cc: akpm@linux-foundation.org, cl@gentwo.org, rientjes@google.com, roman.gushchin@linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20260624100320.430115-1-hao.li@linux.dev> From: "Vlastimil Babka (SUSE)" Autocrypt: addr=vbabka@kernel.org; keydata= xsFNBFZdmxYBEADsw/SiUSjB0dM+vSh95UkgcHjzEVBlby/Fg+g42O7LAEkCYXi/vvq31JTB KxRWDHX0R2tgpFDXHnzZcQywawu8eSq0LxzxFNYMvtB7sV1pxYwej2qx9B75qW2plBs+7+YB 87tMFA+u+L4Z5xAzIimfLD5EKC56kJ1CsXlM8S/LHcmdD9Ctkn3trYDNnat0eoAcfPIP2OZ+ 9oe9IF/R28zmh0ifLXyJQQz5ofdj4bPf8ecEW0rhcqHfTD8k4yK0xxt3xW+6Exqp9n9bydiy tcSAw/TahjW6yrA+6JhSBv1v2tIm+itQc073zjSX8OFL51qQVzRFr7H2UQG33lw2QrvHRXqD Ot7ViKam7v0Ho9wEWiQOOZlHItOOXFphWb2yq3nzrKe45oWoSgkxKb97MVsQ+q2SYjJRBBH4 8qKhphADYxkIP6yut/eaj9ImvRUZZRi0DTc8xfnvHGTjKbJzC2xpFcY0DQbZzuwsIZ8OPJCc LM4S7mT25NE5kUTG/TKQCk922vRdGVMoLA7dIQrgXnRXtyT61sg8PG4wcfOnuWf8577aXP1x 6mzw3/jh3F+oSBHb/GcLC7mvWreJifUL2gEdssGfXhGWBo6zLS3qhgtwjay0Jl+kza1lo+Cv BB2T79D4WGdDuVa4eOrQ02TxqGN7G0Biz5ZLRSFzQSQwLn8fbwARAQABzSNWbGFzdGltaWwg QmFia2EgPHZiYWJrYUBrZXJuZWwub3JnPsLBsAQTAQoAWhYhBKlA1DSZLC6OmRA9UCJPp+fM gqZkBQJqFFy6GxSAAAAAAAQADm1hbnUyLDIuNSsxLjEyLDIsMgIbAwUJGtCBUAULCQgHAwUV CgkICwUWAgMBAAIeBQIXgAAKCRAiT6fnzIKmZJIUEADFx/tREzUImHrEwVHeSvDFmA7tJysI UVrlvrM09E7GIuzphzv7jYmo8n3ANpCczLEVr4G0syYQdTigaZgv3+FQDIIzhKih1IHhu1Ei XHlywNWKnQxxQEUNi5Mwx43wQz5XVw9F1A7gtKBKNtfogO511hAbrzagrYajyQacEJ/+sfhZ 9Da8ltHIXD8pcYaHUfQgEusCgmEd9+KrUwrTbckFKmYq5chuE6yJ4J0EmWknL096jIE6CnzF FRslQ3B1UKDjxVsm1ZHfir5NeWszLkTvGFsddFaWTgh8UycESG6VQzKXjjewXu2pG7YQYRpj QKm1W5X2TkwWkXRBZTmfmbhxIUMh3+zf5wQ463rSmDN/8v81tdqBtAW6rH/kzg1GvkaTHXn0 507yEHFzBksk2viAuIxxr7km8+/KARYLIdGtx30EG8cKzAUZOK6WqxtNCsXUJNrVE8CWrCaD icoNu7Fs1c5hmPHdSTnU48ce67449DdnO4neLSNhRiGlMHJgfJUmgrxu/hcYeOZ3haWmEQ2w uW1Mh01OHi8QZHCEyAbABrPs9GUgccc/4eYXX9hIgxfSkYzn8f+8NuIFPWl/0uTvjgqU29FQ SbzOLxHq9439Ox40G5mS5eZXRGxITYR+6TXvRGI6P/264jvflnr/pDGUttaikU+0W+1uxgKH cmYbEc7ATQRbGTU1AQgAn0H6UrFiWcovkh6EXVcl+SeqyO6JHOPm+e9Wu0Vw+VIUvXZVUVVQ La1PQDUi6j00ChlcR66g9/V0sPIcSutacPKfdKYOBvzd4rlhL8rfrdEsQw5ApZxrA8kYZVMh FmBRKAa6wos25moTlMKpCWzTH84+WO5+ziCTsTUZASAToz3RdunTD+vQcHj0GqNTPAHK63sf bAB2I0BslZkXkY1RLb/YhuA6E7JyEd2pilZOrIuBGl/5q2qSakgnAVFWFBR/DO27JuAksYnq +aH8vI0xGvwn75KqSk4UzAkDzWSmO4ZHuahKtQgZNsMYV+PGayRBX9b9zbldzopoLBdqHc4n jQARAQABwsF8BBgBCgAmAhsMFiEEqUDUNJksLo6ZED1QIk+n58yCpmQFAmfIHFQFCRYU6J8A CgkQIk+n58yCpmS2PA//bqN1LfcotmArgElsa+0EGZSQlYgK48pm8WAeTXTngudP9IJ4SuKY HR5RNjHcBeqN+Me0zxRqYzRb8nGanHEkDyf4Im8DQM8d6vbyU+FcPmG4skud4kgS1zMHnlVd SXfSIwKC/hKgdHG8aBV7545Lz9X6Iohea+94wneD0aw/hqF+QWewGZhWJriWAZtvEkzNjQOi 4U9F/trLten/x7bpphDSnDMKJtITbtzATT1Dq7o7VpIUK1nCTQALMuMjKCdi8OdU/+V+R3O4 0PXWvX8qrvqYapVbZ+9KqT74FsuB0Ya9uXwgBF2Q6cRuETZk5vqaqKxzqoQZCO8AOz/58j6O 2RHNy/mZEN+7tJ5Tsq42zVJ4jxsT8b9YplavCMsnBgDeRWhcbYhCyttoL7nYISyWg4kQYZ/P wIV3OuNv2f8iKYsxNsRuClOAF82+gvqOy1/1pprFjy8uo2pkoOrb63aOP3vO5VHnRKgra6dq NcaZ+c6J4H+nEJGi2SkHAUJz5oBzuThvPudLvPA/SK8sKoM01IRxSihev/S/5WLazXB1PGem OCbvzC1IjWJJraxiDJ5IygokapUa2RP7+WBR22skQ3SSl6G107QgWKSyTOGWEaRmV53vxQLV jXuCmzSSasTL60zq5yGrT4/DYQVSNEUiUbG4pYekxJujNeEDkUlky0Y= In-Reply-To: <20260624100320.430115-1-hao.li@linux.dev> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Stat-Signature: nqwkcewt837fq1oomy13sf7x94iuratk X-Rspam-User: X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: BEA65A0004 X-HE-Tag: 1782472109-932064 X-HE-Meta: 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 jha2VKtp 6zpRxzl95+UztiFiMRZggwbP1ubteJwTvYMF4xL00oMyddw7DdG3ukAXFf2o8trXxWfwGSyI2kH7WEqo7PoWIqVIJt1N8BrGf/jebT5HsQZvUMpIk8Fu6iBbr4t4bDrSghuVJhSzNdxWPLN9SQLBC2fcgHmsBz1bOqYEf/l7sXwpvw6+sGxui9nK0dUMVjbE+HZBVVItHcvL52yLlgjhbqIkinmItV2Myho6dEU7D/974d3WIe7lbuKd9xVE/v9jK5aIv Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 6/24/26 12:00, Hao Li wrote: > Currently, alloc_from_pcs() and __slab_alloc_node() both calculate the > NUMA policy independently. Since they are called consecutively in paths > like __kmalloc_nolock_noprof() and slab_alloc_node(), this leads to > redundant code snippets. > > Introduce a helper function to resolve the NUMA policy once, eliminating > the duplicated code and reducing execution overhead. > > Also remove __slab_alloc_node() function because it is almost empty. > The callers of __slab_alloc_node now call ___slab_alloc() directly. > > Additional notes: > > Previously, when slab_strict_numa was enabled, alloc_from_pcs() and > __slab_alloc_node() could each resolve the task mempolicy, so > MPOL_INTERLEAVE or MPOL_WEIGHTED_INTERLEAVE could advance the > interleave state twice for a single object allocation attempt. > And each retry will also advance the interleave state. > > With this change, the strict NUMA node is resolved once and reused by > both alloc_from_pcs() and ___slab_alloc() in each retry. > > This is a behavior change, but it better matches the intent of > selecting one policy node for one allocation attempt. > > Signed-off-by: Hao Li Cool! Added to slab/for-7.3/misc, will exponse to -next after 7.2-rc1.