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SubjectRe: [RFC][PATCH v2 00/21] PMEM NUMA node and hotness accounting/migration
On Fri, Dec 28, 2018 at 01:15:15PM +0100, Michal Hocko wrote:
>On Fri 28-12-18 17:42:08, Wu Fengguang wrote:
>[...]
>> Those look unnecessary complexities for this post. This v2 patchset
>> mainly fulfills our first milestone goal: a minimal viable solution
>> that's relatively clean to backport. Even when preparing for new
>> upstreamable versions, it may be good to keep it simple for the
>> initial upstream inclusion.
>
>On the other hand this is creating a new NUMA semantic and I would like
>to have something long term thatn let's throw something in now and care
>about long term later. So I would really prefer to talk about long term
>plans first and only care about implementation details later.

That makes good sense. FYI here are the several in-house patches that
try to leverage (but not yet integrate with) NUMA balancing. The last
one is brutal force hacking. They obviously break original NUMA
balancing logic.

Thanks,
Fengguang
From ef41a542568913c8c62251021c3bc38b7a549440 Mon Sep 17 00:00:00 2001
From: Liu Jingqi <jingqi.liu@intel.com>
Date: Sat, 29 Sep 2018 23:29:56 +0800
Subject: [PATCH 074/166] migrate: set PROT_NONE on the PTEs and let NUMA
balancing

Need to enable CONFIG_NUMA_BALANCING firstly.
Set PROT_NONE on the PTEs that map to the page,
and do the actual migration in the context of process which initiate migration.

Signed-off-by: Liu Jingqi <jingqi.liu@intel.com>
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
---
mm/migrate.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)

diff --git a/mm/migrate.c b/mm/migrate.c
index b27a287081c2..d933f6966601 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1530,6 +1530,21 @@ static int add_page_for_migration(struct mm_struct *mm, unsigned long addr,
if (page_mapcount(page) > 1 && !migrate_all)
goto out_putpage;

+ if (flags & MPOL_MF_SW_YOUNG) {
+ unsigned long start, end;
+ unsigned long nr_pte_updates = 0;
+
+ start = max(addr, vma->vm_start);
+
+ /* TODO: if huge page */
+ end = ALIGN(addr + (1 << PAGE_SHIFT), PAGE_SIZE);
+ end = min(end, vma->vm_end);
+ nr_pte_updates = change_prot_numa(vma, start, end);
+
+ err = 0;
+ goto out_putpage;
+ }
+
if (PageHuge(page)) {
if (PageHead(page)) {
/* Check if the page is software young. */
--
2.15.0
From e617e8c2034387cbed50bafa786cf83528dbe3df Mon Sep 17 00:00:00 2001
From: Fengguang Wu <fengguang.wu@intel.com>
Date: Sun, 30 Sep 2018 10:50:58 +0800
Subject: [PATCH 075/166] migrate: consolidate MPOL_MF_SW_YOUNG behaviors

- if page already in target node: SetPageReferenced
- otherwise: change_prot_numa

Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
---
arch/x86/kvm/Kconfig | 1 +
mm/migrate.c | 65 +++++++++++++++++++++++++++++++---------------------
2 files changed, 40 insertions(+), 26 deletions(-)

diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig
index 4c6dec47fac6..c103373536fc 100644
--- a/arch/x86/kvm/Kconfig
+++ b/arch/x86/kvm/Kconfig
@@ -100,6 +100,7 @@ config KVM_EPT_IDLE
tristate "KVM EPT idle page tracking"
depends on KVM_INTEL
depends on PROC_PAGE_MONITOR
+ depends on NUMA_BALANCING
---help---
Provides support for walking EPT to get the A bits on Intel
processors equipped with the VT extensions.
diff --git a/mm/migrate.c b/mm/migrate.c
index d933f6966601..d944f031c9ea 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1500,6 +1500,8 @@ static int add_page_for_migration(struct mm_struct *mm, unsigned long addr,
{
struct vm_area_struct *vma;
struct page *page;
+ unsigned long end;
+ unsigned int page_nid;
unsigned int follflags;
int err;
bool migrate_all = flags & MPOL_MF_MOVE_ALL;
@@ -1522,49 +1524,60 @@ static int add_page_for_migration(struct mm_struct *mm, unsigned long addr,
if (!page)
goto out;

- err = 0;
- if (page_to_nid(page) == node)
- goto out_putpage;
+ page_nid = page_to_nid(page);

err = -EACCES;
if (page_mapcount(page) > 1 && !migrate_all)
goto out_putpage;

- if (flags & MPOL_MF_SW_YOUNG) {
- unsigned long start, end;
- unsigned long nr_pte_updates = 0;
-
- start = max(addr, vma->vm_start);
-
- /* TODO: if huge page */
- end = ALIGN(addr + (1 << PAGE_SHIFT), PAGE_SIZE);
- end = min(end, vma->vm_end);
- nr_pte_updates = change_prot_numa(vma, start, end);
-
- err = 0;
- goto out_putpage;
- }
-
+ err = 0;
if (PageHuge(page)) {
- if (PageHead(page)) {
- /* Check if the page is software young. */
- if (flags & MPOL_MF_SW_YOUNG)
+ if (!PageHead(page)) {
+ err = -EACCES;
+ goto out_putpage;
+ }
+ if (flags & MPOL_MF_SW_YOUNG) {
+ if (page_nid == node)
SetPageReferenced(page);
- isolate_huge_page(page, pagelist);
- err = 0;
+ else if (PageAnon(page)) {
+ end = addr + (hpage_nr_pages(page) << PAGE_SHIFT);
+ if (end <= vma->vm_end)
+ change_prot_numa(vma, addr, end);
+ }
+ goto out_putpage;
}
+ if (page_nid == node)
+ goto out_putpage;
+ isolate_huge_page(page, pagelist);
} else {
struct page *head;

head = compound_head(page);
+
+ if (flags & MPOL_MF_SW_YOUNG) {
+ if (page_nid == node)
+ SetPageReferenced(head);
+ else {
+ unsigned long size;
+ size = hpage_nr_pages(head) << PAGE_SHIFT;
+ end = addr + size;
+ if (unlikely(addr & (size - 1)))
+ err = -EXDEV;
+ else if (likely(end <= vma->vm_end))
+ change_prot_numa(vma, addr, end);
+ else
+ err = -ERANGE;
+ }
+ goto out_putpage;
+ }
+ if (page_nid == node)
+ goto out_putpage;
+
err = isolate_lru_page(head);
if (err)
goto out_putpage;

err = 0;
- /* Check if the page is software young. */
- if (flags & MPOL_MF_SW_YOUNG)
- SetPageReferenced(head);
list_add_tail(&head->lru, pagelist);
mod_node_page_state(page_pgdat(head),
NR_ISOLATED_ANON + page_is_file_cache(head),
--
2.15.0
From a2d9740d1639f807868014c16dc9e2620d356f3c Mon Sep 17 00:00:00 2001
From: Fengguang Wu <fengguang.wu@intel.com>
Date: Sun, 30 Sep 2018 19:22:27 +0800
Subject: [PATCH 076/166] mempolicy: force NUMA balancing

Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
---
mm/memory.c | 3 ++-
mm/mempolicy.c | 5 -----
2 files changed, 2 insertions(+), 6 deletions(-)

diff --git a/mm/memory.c b/mm/memory.c
index c467102a5cbc..20c7efdff63b 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3775,7 +3775,8 @@ static int numa_migrate_prep(struct page *page, struct vm_area_struct *vma,
*flags |= TNF_FAULT_LOCAL;
}

- return mpol_misplaced(page, vma, addr);
+ return 0;
+ /* return mpol_misplaced(page, vma, addr); */
}

static vm_fault_t do_numa_page(struct vm_fault *vmf)
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index da858f794eb6..21dc6ba1d062 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -2295,8 +2295,6 @@ int mpol_misplaced(struct page *page, struct vm_area_struct *vma, unsigned long
int ret = -1;

pol = get_vma_policy(vma, addr);
- if (!(pol->flags & MPOL_F_MOF))
- goto out;

switch (pol->mode) {
case MPOL_INTERLEAVE:
@@ -2336,9 +2334,6 @@ int mpol_misplaced(struct page *page, struct vm_area_struct *vma, unsigned long
/* Migrate the page towards the node whose CPU is referencing it */
if (pol->flags & MPOL_F_MORON) {
polnid = thisnid;
-
- if (!should_numa_migrate_memory(current, page, curnid, thiscpu))
- goto out;
}

if (curnid != polnid)
--
2.15.0
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