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| author | Michal Hocko <mhocko@suse.com> | 2017-07-11 00:48:47 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-07-11 01:32:31 +0200 |
| commit | 8b9132388964df2cfe151a88fd1dd8219dabf23c (patch) | |
| tree | 4b4fb6c14c4cc44bcf5be7a4827ba2681f6f7a3e /mm/memory_hotplug.c | |
| parent | hugetlb, memory_hotplug: prefer to use reserved pages for migration (diff) | |
| download | linux-8b9132388964df2cfe151a88fd1dd8219dabf23c.tar.xz linux-8b9132388964df2cfe151a88fd1dd8219dabf23c.zip | |
mm: unify new_node_page and alloc_migrate_target
Commit 394e31d2ceb4 ("mem-hotplug: alloc new page from a nearest
neighbor node when mem-offline") has duplicated a large part of
alloc_migrate_target with some hotplug specific special casing.
To be more precise it tried to enfore the allocation from a different
node than the original page. As a result the two function diverged in
their shared logic, e.g. the hugetlb allocation strategy.
Let's unify the two and express different NUMA requirements by the given
nodemask. new_node_page will simply exclude the node it doesn't care
about and alloc_migrate_target will use all the available nodes.
alloc_migrate_target will then learn to migrate hugetlb pages more
sanely and use preallocated pool when possible.
Please note that alloc_migrate_target used to call alloc_page resp.
alloc_pages_current so the memory policy of the current context which is
quite strange when we consider that it is used in the context of
alloc_contig_range which just tries to migrate pages which stand in the
way.
Link: http://lkml.kernel.org/r/20170608074553.22152-4-mhocko@kernel.org
Signed-off-by: Michal Hocko <mhocko@suse.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Xishi Qiu <qiuxishi@huawei.com>
Cc: zhong jiang <zhongjiang@huawei.com>
Cc: Joonsoo Kim <js1304@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memory_hotplug.c')
| -rw-r--r-- | mm/memory_hotplug.c | 11 |
1 files changed, 1 insertions, 10 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 1cf3404bd065..203c46306a74 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -1433,7 +1433,6 @@ static unsigned long scan_movable_pages(unsigned long start, unsigned long end) static struct page *new_node_page(struct page *page, unsigned long private, int **result) { - gfp_t gfp_mask = GFP_USER | __GFP_MOVABLE; int nid = page_to_nid(page); nodemask_t nmask = node_states[N_MEMORY]; @@ -1446,15 +1445,7 @@ static struct page *new_node_page(struct page *page, unsigned long private, if (nodes_empty(nmask)) node_set(nid, nmask); - if (PageHuge(page)) - return alloc_huge_page_nodemask( - page_hstate(compound_head(page)), &nmask); - - if (PageHighMem(page) - || (zone_idx(page_zone(page)) == ZONE_MOVABLE)) - gfp_mask |= __GFP_HIGHMEM; - - return __alloc_pages_nodemask(gfp_mask, 0, nid, &nmask); + return new_page_nodemask(page, nid, &nmask); } #define NR_OFFLINE_AT_ONCE_PAGES (256) |