From: Zi Yan <zi.yan@sent.com>
To: linux-mm@kvack.org
Cc: dnellans@nvidia.com, apopple@au1.ibm.com,
paulmck@linux.vnet.ibm.com, khandual@linux.vnet.ibm.com,
zi.yan@cs.rutgers.edu
Subject: [RFC PATCH 06/14] sysctl: Add global tunable mt_page_copy
Date: Fri, 17 Feb 2017 10:05:43 -0500 [thread overview]
Message-ID: <20170217150551.117028-7-zi.yan@sent.com> (raw)
In-Reply-To: <20170217150551.117028-1-zi.yan@sent.com>
From: Zi Yan <ziy@nvidia.com>
A new global sysctl tunable 'mt_page_copy' is added which will override
syscall specific requests and enable multi threaded page copy during
all migrations on the system. This tunable is disabled by default.
Signed-off-by: Zi Yan <zi.yan@cs.rutgers.edu>
Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com>
---
kernel/sysctl.c | 11 +++++++++++
mm/migrate.c | 5 +++++
2 files changed, 16 insertions(+)
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 5b8c0fb3f0ea..70a654146519 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -97,6 +97,8 @@
#if defined(CONFIG_SYSCTL)
+extern int mt_page_copy;
+
/* External variables not in a header file. */
extern int suid_dumpable;
#ifdef CONFIG_COREDUMP
@@ -1360,6 +1362,15 @@ static struct ctl_table vm_table[] = {
.proc_handler = &hugetlb_mempolicy_sysctl_handler,
},
#endif
+ {
+ .procname = "mt_page_copy",
+ .data = &mt_page_copy,
+ .maxlen = sizeof(mt_page_copy),
+ .mode = 0644,
+ .proc_handler = proc_dointvec,
+ .extra1 = &zero,
+ .extra2 = &one,
+ },
{
.procname = "hugetlb_shm_group",
.data = &sysctl_hugetlb_shm_group,
diff --git a/mm/migrate.c b/mm/migrate.c
index 2e58aad7c96f..0e9b1f17cf8b 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -48,6 +48,8 @@
#include "internal.h"
+int mt_page_copy = 0;
+
/*
* migrate_prep() needs to be called before we start compiling a list of pages
* to be migrated using isolate_lru_page(). If scheduling work on other CPUs is
@@ -618,6 +620,9 @@ static void copy_huge_page(struct page *dst, struct page *src,
nr_pages = hpage_nr_pages(src);
}
+ if (mt_page_copy)
+ mode |= MIGRATE_MT;
+
if (mode & MIGRATE_MT)
rc = copy_pages_mthread(dst, src, nr_pages);
--
2.11.0
--
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next prev parent reply other threads:[~2017-02-17 15:06 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-17 15:05 [RFC PATCH 00/14] Accelerating page migrations Zi Yan
2017-02-17 15:05 ` [RFC PATCH 01/14] mm/migrate: Add new mode parameter to migrate_page_copy() function Zi Yan
2017-02-17 15:05 ` [RFC PATCH 02/14] mm/migrate: Make migrate_mode types non-exclussive Zi Yan
2017-02-17 15:05 ` [RFC PATCH 03/14] mm/migrate: Add copy_pages_mthread function Zi Yan
2017-02-23 6:06 ` Naoya Horiguchi
2017-02-23 7:50 ` Anshuman Khandual
2017-02-23 8:02 ` Naoya Horiguchi
2017-03-09 5:35 ` Anshuman Khandual
2017-02-17 15:05 ` [RFC PATCH 04/14] mm/migrate: Add new migrate mode MIGRATE_MT Zi Yan
2017-02-23 6:54 ` Naoya Horiguchi
2017-02-23 7:54 ` Anshuman Khandual
2017-02-17 15:05 ` [RFC PATCH 05/14] mm/migrate: Add new migration flag MPOL_MF_MOVE_MT for syscalls Zi Yan
2017-02-17 15:05 ` Zi Yan [this message]
2017-02-17 15:05 ` [RFC PATCH 07/14] migrate: Add copy_page_lists_mthread() function Zi Yan
2017-02-23 8:54 ` Naoya Horiguchi
2017-03-09 13:02 ` Anshuman Khandual
2017-02-17 15:05 ` [RFC PATCH 08/14] mm: migrate: Add concurrent page migration into move_pages syscall Zi Yan
2017-02-24 8:25 ` Naoya Horiguchi
2017-02-24 15:05 ` Zi Yan
2017-02-17 15:05 ` [RFC PATCH 09/14] mm: migrate: Add exchange_page_mthread() and exchange_page_lists_mthread() to exchange two pages or two page lists Zi Yan
2017-02-17 15:05 ` [RFC PATCH 10/14] mm: Add exchange_pages and exchange_pages_concur functions to exchange two lists of pages instead of two migrate_pages() Zi Yan
2017-02-17 15:05 ` [RFC PATCH 11/14] mm: migrate: Add exchange_pages syscall to exchange two page lists Zi Yan
2017-02-17 15:05 ` [RFC PATCH 12/14] migrate: Add copy_page_dma to use DMA Engine to copy pages Zi Yan
2017-02-17 15:05 ` [RFC PATCH 13/14] mm: migrate: Add copy_page_dma into migrate_page_copy Zi Yan
2017-02-17 15:05 ` [RFC PATCH 14/14] mm: Add copy_page_lists_dma_always to support copy a list of pages Zi Yan
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