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Date: Fri, 17 Feb 2017 16:54:52 +0530 From: Anshuman Khandual <khandual@...ux.vnet.ibm.com> To: linux-kernel@...r.kernel.org, linux-mm@...ck.org Cc: mhocko@...e.com, vbabka@...e.cz, mgorman@...e.de, minchan@...nel.org, aneesh.kumar@...ux.vnet.ibm.com, bsingharora@...il.com, srikar@...ux.vnet.ibm.com, haren@...ux.vnet.ibm.com, jglisse@...hat.com, dave.hansen@...el.com, dan.j.williams@...el.com, zi.yan@...rutgers.edu Subject: [PATCH 5/6] mm/migrate: Add new migration flag MPOL_MF_MOVE_MT for syscalls From: Zi Yan <ziy@...dia.com> This change adds a new mode flag MPOL_MF_MOVE_MT for migration system calls like move_pages() and mbind() which indicates request for using the multi threaded copy method. Signed-off-by: Zi Yan <zi.yan@...rutgers.edu> Signed-off-by: Anshuman Khandual <khandual@...ux.vnet.ibm.com> --- include/uapi/linux/mempolicy.h | 4 +++- mm/mempolicy.c | 7 ++++++- mm/migrate.c | 14 ++++++++++---- 3 files changed, 19 insertions(+), 6 deletions(-) diff --git a/include/uapi/linux/mempolicy.h b/include/uapi/linux/mempolicy.h index 9cd8b21..8f1db2e 100644 --- a/include/uapi/linux/mempolicy.h +++ b/include/uapi/linux/mempolicy.h @@ -53,10 +53,12 @@ enum mpol_rebind_step { #define MPOL_MF_MOVE_ALL (1<<2) /* Move every page to conform to policy */ #define MPOL_MF_LAZY (1<<3) /* Modifies '_MOVE: lazy migrate on fault */ #define MPOL_MF_INTERNAL (1<<4) /* Internal flags start here */ +#define MPOL_MF_MOVE_MT (1<<6) /* Use multi-threaded page copy routine */ #define MPOL_MF_VALID (MPOL_MF_STRICT | \ MPOL_MF_MOVE | \ - MPOL_MF_MOVE_ALL) + MPOL_MF_MOVE_ALL | \ + MPOL_MF_MOVE_MT) /* * Internal flags that share the struct mempolicy flags word with diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 1e7873e..ef7c586 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -1244,9 +1244,14 @@ static long do_mbind(unsigned long start, unsigned long len, int nr_failed = 0; if (!list_empty(&pagelist)) { + enum migrate_mode mode = MIGRATE_SYNC; + + if (flags & MPOL_MF_MOVE_MT) + mode |= MIGRATE_MT; + WARN_ON_ONCE(flags & MPOL_MF_LAZY); nr_failed = migrate_pages(&pagelist, new_page, NULL, - start, MIGRATE_SYNC, MR_MEMPOLICY_MBIND); + start, mode, MR_MEMPOLICY_MBIND); if (nr_failed) putback_movable_pages(&pagelist); } diff --git a/mm/migrate.c b/mm/migrate.c index 6ac3572..660c4b2 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -1429,11 +1429,16 @@ static struct page *new_page_node(struct page *p, unsigned long private, */ static int do_move_page_to_node_array(struct mm_struct *mm, struct page_to_node *pm, - int migrate_all) + int migrate_all, + int migrate_use_mt) { int err; struct page_to_node *pp; LIST_HEAD(pagelist); + enum migrate_mode mode = MIGRATE_SYNC; + + if (migrate_use_mt) + mode |= MIGRATE_MT; down_read(&mm->mmap_sem); @@ -1501,7 +1506,7 @@ static int do_move_page_to_node_array(struct mm_struct *mm, err = 0; if (!list_empty(&pagelist)) { err = migrate_pages(&pagelist, new_page_node, NULL, - (unsigned long)pm, MIGRATE_SYNC, MR_SYSCALL); + (unsigned long)pm, mode, MR_SYSCALL); if (err) putback_movable_pages(&pagelist); } @@ -1578,7 +1583,8 @@ static int do_pages_move(struct mm_struct *mm, nodemask_t task_nodes, /* Migrate this chunk */ err = do_move_page_to_node_array(mm, pm, - flags & MPOL_MF_MOVE_ALL); + flags & MPOL_MF_MOVE_ALL, + flags & MPOL_MF_MOVE_MT); if (err < 0) goto out_pm; @@ -1685,7 +1691,7 @@ SYSCALL_DEFINE6(move_pages, pid_t, pid, unsigned long, nr_pages, nodemask_t task_nodes; /* Check flags */ - if (flags & ~(MPOL_MF_MOVE|MPOL_MF_MOVE_ALL)) + if (flags & ~(MPOL_MF_MOVE|MPOL_MF_MOVE_ALL|MPOL_MF_MOVE_MT)) return -EINVAL; if ((flags & MPOL_MF_MOVE_ALL) && !capable(CAP_SYS_NICE)) -- 2.9.3
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