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 GWM5lldn owA3icam1Bc4uDFDiiaHQHduNlhM578D3YwHMAqDmZIClTN5rd+XqfJy331OhWm15kvX/qxZj97tJ+XPMq7AU+ViSn+viuU0pHTJktAUzx6z+SUno9eQn2tStzjsY5E6gKcxz+eECk/eVOJzWoEVZeq+BnvdX/QWm75lFpW+I9G4mQ3zz1yl4+NJIMwip9928bzUyEOcPFsz7GU7koPX9jEWo2qMtOCAGqJxgdXkYPgV/wCNjFJqjeKmTWxe2jnXFvkSOy7RrN2bljxJI46uBKYBP4x69hmb4QmjUlvK2WoAvZFxtbwNFcWqu18wwAz7cKskmcSmXvZwm2oDkpqlBN/HMq9fuOiRYnBti1J6PZAZ1DsKQXUrTBIqAV/pYqZ6Rz7cAQ0+dVWw2CLzaHNIyaR7yva9qMiwgiVKCW84P0oo1FmL8EuzuhDHJ2+bHZyJcQfftNPitbf+7tbSZD1N6/p8jsGxdSooX2B5deDq4UufFpos= 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: List-Subscribe: List-Unsubscribe: On 5 Jan 2026, at 11:17, Ryan Roberts wrote: > Hi All, > > A recent change to vmalloc caused some performance benchmark regressions = (see > [1]). I'm attempting to fix that (and at the same time signficantly impro= ve > beyond the baseline) by freeing a contiguous set of order-0 pages as a ba= tch. > > At the same time I observed that free_contig_range() was essentially doin= g the > same thing as vfree() so I've fixed it there too. > > I think I've convinced myself that free_pages_prepare() per order-0 page > followed by a single free_frozen_page_commit() or free_one_page() for the= high > order block is safe/correct, but would be good if a page_alloc expert can > confirm! > > Applies against today's mm-unstable (344d3580dacd). All mm selftests run = and > pass. Kefeng has a series on using frozen pages for alloc_contig*() in mm-new and touches free_contig_range() as well. You might want to rebase on top of that. I like your approach of freeing multiple order-0 pages as a batch, since they are essentially a non-compound high order page. I also pointed out a similar optimization when reviewing Kefeng=E2=80=99s patchset[1] (see my = comment on __free_contig_frozen_range()). In terms of rebase, there should be minor for free_contig_range(). In addit= ion, maybe your free_prepared_contig_range() can replace __free_contig_frozen_ra= nge() in Kefeng=E2=80=99s version to improve performance for both code paths. I will take a look at the patches. Thanks. [1] https://lore.kernel.org/linux-mm/D90F7769-F3A8-4234-A9CE-F97BC48CCACE@n= vidia.com/ > > Thanks, > Ryan > > Ryan Roberts (2): > mm/page_alloc: Optimize free_contig_range() > vmalloc: Optimize vfree > > include/linux/gfp.h | 1 + > mm/page_alloc.c | 116 +++++++++++++++++++++++++++++++++++++++----- > mm/vmalloc.c | 29 +++++++---- > 3 files changed, 125 insertions(+), 21 deletions(-) > > -- > 2.43.0 Best Regards, Yan, Zi