On 11 Sep 2023, at 15:41, Johannes Weiner wrote: > The buddy allocator coalesces compatible blocks during freeing, but it > doesn't update the types of the subblocks to match. When an allocation > later breaks the chunk down again, its pieces will be put on freelists > of the wrong type. This encourages incompatible page mixing (ask for > one type, get another), and thus long-term fragmentation. > > Update the subblocks when merging a larger chunk, such that a later > expand() will maintain freelist type hygiene. > > v2: > - remove spurious change_pageblock_range() move (Zi Yan) > > Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx> > --- > mm/page_alloc.c | 15 +++++++++++---- > 1 file changed, 11 insertions(+), 4 deletions(-) > LGTM. Reviewed-by: Zi Yan <ziy@xxxxxxxxxx> -- Best Regards, Yan, Zi
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