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authorBaolin Wang <baolin.wang@linux.alibaba.com>2024-03-06 11:13:26 +0100
committerAndrew Morton <akpm@linux-foundation.org>2024-04-26 05:56:06 +0200
commite42dfe4e0a51b476dcc6f1461c51fdb1b76573aa (patch)
treec122fbfd6a59507ed8c0ca59bf091a238b4834a1 /mm/mempolicy.c
parentmm/vmalloc: eliminated the lock contention from twice to once (diff)
downloadlinux-e42dfe4e0a51b476dcc6f1461c51fdb1b76573aa.tar.xz
linux-e42dfe4e0a51b476dcc6f1461c51fdb1b76573aa.zip
mm: record the migration reason for struct migration_target_control
Patch series "make the hugetlb migration strategy consistent", v2. As discussed in previous thread [1], there is an inconsistency when handling hugetlb migration. When handling the migration of freed hugetlb, it prevents fallback to other NUMA nodes in alloc_and_dissolve_hugetlb_folio(). However, when dealing with in-use hugetlb, it allows fallback to other NUMA nodes in alloc_hugetlb_folio_nodemask(), which can break the per-node hugetlb pool and might result in unexpected failures when node bound workloads doesn't get what is asssumed available. This patchset tries to make the hugetlb migration strategy more clear and consistent. Please find details in each patch. [1] https://lore.kernel.org/all/6f26ce22d2fcd523418a085f2c588fe0776d46e7.1706794035.git.baolin.wang@linux.alibaba.com/ This patch (of 2): To support different hugetlb allocation strategies during hugetlb migration based on various migration reasons, record the migration reason in the migration_target_control structure as a preparation. Link: https://lkml.kernel.org/r/cover.1709719720.git.baolin.wang@linux.alibaba.com Link: https://lkml.kernel.org/r/7b95d4981e07211f57139fc5b1f7ce91b920cee4.1709719720.git.baolin.wang@linux.alibaba.com Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com> Reviewed-by: Oscar Salvador <osalvador@suse.de> Cc: David Hildenbrand <david@redhat.com> Cc: Miaohe Lin <linmiaohe@huawei.com> Cc: Michal Hocko <mhocko@kernel.org> Cc: Muchun Song <muchun.song@linux.dev> Cc: Naoya Horiguchi <nao.horiguchi@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/mempolicy.c')
-rw-r--r--mm/mempolicy.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 0b3def99174a..e128e6b7bbcb 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1070,6 +1070,7 @@ static long migrate_to_node(struct mm_struct *mm, int source, int dest,
struct migration_target_control mtc = {
.nid = dest,
.gfp_mask = GFP_HIGHUSER_MOVABLE | __GFP_THISNODE,
+ .reason = MR_SYSCALL,
};
nodes_clear(nmask);