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b=PgTSUEgwMViH9O0Ctr4/qFmBqyKGp8mKypOH/GL3h1tiuiVoXPmvH2PDulvh//mXr 6OJgE+08XLyLJUoH6Tun3qo3auANuR++qibQYliCWXIl8WG/HqaS1l8yIXsrF2qrrw Q6/oJj7rQr3YKWtzi3ZmehRZc8li4xJ/8gfBVj6fxOybShSY2DpkfVZvveVgctS1OD gx8Cj6zoeuF9N885LzwELKeiRG3ATJR/bh4plwQfjdoPjQ6I6doV/zkslHoykDT2kE xuSlObK1xmeWQ8MonF0DSj9q54qLj5w+rCOD0leWywfZowEiocPUTjcOXW2psvUPdt f0MSWxQlMo0Ag== Message-ID: <0afd7bf5-a059-4cf2-b9cf-e028b4eb86dd@kernel.org> Date: Mon, 7 Sep 2026 17:03:06 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] mm/slub: unify slub stat definitions to simplify metric additions 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: <20260814071848.46922-1-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: <20260814071848.46922-1-hao.li@linux.dev> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 14FD71C000B X-Stat-Signature: n1746rk6yexc7qkoma9ie441gfkm17r9 X-Rspam-User: X-HE-Tag: 1788793390-846337 X-HE-Meta: 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 wUTvPhx6 fWB2xas2pk4HvZkFIrdlLQizQOLGMjO+P6yIvVn7MHZ3ugAof/ynLz3HgPvdD0DIWPCPKBovA9ricjz3WuCr+7kjP2jCnxJqrlmnB5iCFJqeQTK1PggpYeZVzPuZNMV5eM6GYodd86CN6ic3HRbyuLVclhwD9ZP8ZNTjXE4dXf25xGFsnXPYmdFv/RBMj/Ao+wjhKAgzL57vuI9c7zNuOuz89X7sfo/uMk9gZcb1NdRL+W/APSaSp3WPiSl74nepuW50V Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 8/14/26 09:17, Hao Li wrote: > Currently, adding a new slub stat requires modifying three separate > locations: stat_item, STAT_ATTR, and slab_attrs. This is inconvenient, > especially when temporarily adding metrics for debugging during > development. > > This patch borrows the approach from SCHED_FEAT by introducing an ITEM_EXP > X-macro, which is then temporarily defined as different operations at the > three locations (stat_item, STAT_ATTR, and slab_attrs) to perform distinct > macro expansions. > > Going forward, adding a new metric only requires adding a single line: > ITEM_EXP(XXX, xxx) > > Signed-off-by: Hao Li Nice, thanks! Added to mm/slab.git slab/for-7.4/misc -> slab/for-next