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| author | Ohhoon Kwon <ohoono.kwon@samsung.com> | 2021-09-03 00:57:01 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-09-03 19:58:14 +0300 |
| commit | fc1f5e980a463325cf41d39ac6a69aa3cca73995 (patch) | |
| tree | 79507c488549d1a0c253e3d2b67d9fb24c093637 /mm/sparse.c | |
| parent | a1bc561bb2d3d9b944878955095f53aeba30a166 (diff) | |
| download | linux-fc1f5e980a463325cf41d39ac6a69aa3cca73995.tar.xz | |
mm: sparse: pass section_nr to find_memory_block
With CONFIG_SPARSEMEM_EXTREME enabled, __section_nr() which converts
mem_section to section_nr could be costly since it iterates all section
roots to check if the given mem_section is in its range.
On the other hand, __nr_to_section() which converts section_nr to
mem_section can be done in O(1).
Let's pass section_nr instead of mem_section ptr to find_memory_block() in
order to reduce needless iterations.
Link: https://lkml.kernel.org/r/20210707150212.855-3-ohoono.kwon@samsung.com
Signed-off-by: Ohhoon Kwon <ohoono.kwon@samsung.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Mike Rapoport <rppt@linux.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Baoquan He <bhe@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/sparse.c')
0 files changed, 0 insertions, 0 deletions