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Message-ID: <5028E20C.3080607@linux.vnet.ibm.com>
Date: Mon, 13 Aug 2012 19:16:28 +0800
From: Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
To: Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
CC: Andrew Morton <akpm@...ux-foundation.org>,
Andrea Arcangeli <aarcange@...hat.com>,
Hugh Dickins <hughd@...gle.com>,
David Rientjes <rientjes@...gle.com>,
LKML <linux-kernel@...r.kernel.org>,
Linux Memory Management List <linux-mm@...ck.org>
Subject: [PATCH 09/12] thp: introduce khugepaged_prealloc_page and khugepaged_alloc_page
They are used to abstract the difference between NUMA enabled and NUMA disabled
to make the code more readable
Signed-off-by: Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
---
mm/huge_memory.c | 166 ++++++++++++++++++++++++++++++++----------------------
1 files changed, 98 insertions(+), 68 deletions(-)
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 050b8d0..82f6cce 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1833,28 +1833,34 @@ static void __collapse_huge_page_copy(pte_t *pte, struct page *page,
}
}
-static void collapse_huge_page(struct mm_struct *mm,
- unsigned long address,
- struct page **hpage,
- struct vm_area_struct *vma,
- int node)
+static void khugepaged_alloc_sleep(void)
{
- pgd_t *pgd;
- pud_t *pud;
- pmd_t *pmd, _pmd;
- pte_t *pte;
- pgtable_t pgtable;
- struct page *new_page;
- spinlock_t *ptl;
- int isolated;
- unsigned long hstart, hend;
+ wait_event_freezable_timeout(khugepaged_wait, false,
+ msecs_to_jiffies(khugepaged_alloc_sleep_millisecs));
+}
- VM_BUG_ON(address & ~HPAGE_PMD_MASK);
-#ifndef CONFIG_NUMA
- up_read(&mm->mmap_sem);
- VM_BUG_ON(!*hpage);
- new_page = *hpage;
-#else
+#ifdef CONFIG_NUMA
+static bool khugepaged_prealloc_page(struct page **hpage, bool *wait)
+{
+ if (IS_ERR(*hpage)) {
+ if (!*wait)
+ return false;
+
+ *wait = false;
+ khugepaged_alloc_sleep();
+ } else if (*hpage) {
+ put_page(*hpage);
+ *hpage = NULL;
+ }
+
+ return true;
+}
+
+static struct page
+*khugepaged_alloc_page(struct page **hpage, struct mm_struct *mm,
+ struct vm_area_struct *vma, unsigned long address,
+ int node)
+{
VM_BUG_ON(*hpage);
/*
* Allocate the page while the vma is still valid and under
@@ -1866,7 +1872,7 @@ static void collapse_huge_page(struct mm_struct *mm,
* mmap_sem in read mode is good idea also to allow greater
* scalability.
*/
- new_page = alloc_hugepage_vma(khugepaged_defrag(), vma, address,
+ *hpage = alloc_hugepage_vma(khugepaged_defrag(), vma, address,
node, __GFP_OTHER_NODE);
/*
@@ -1874,15 +1880,81 @@ static void collapse_huge_page(struct mm_struct *mm,
* preparation for taking it in write mode.
*/
up_read(&mm->mmap_sem);
- if (unlikely(!new_page)) {
+ if (unlikely(!*hpage)) {
count_vm_event(THP_COLLAPSE_ALLOC_FAILED);
*hpage = ERR_PTR(-ENOMEM);
- return;
+ return NULL;
}
- *hpage = new_page;
+
count_vm_event(THP_COLLAPSE_ALLOC);
+ return *hpage;
+}
+#else
+static struct page *khugepaged_alloc_hugepage(bool *wait)
+{
+ struct page *hpage;
+
+ do {
+ hpage = alloc_hugepage(khugepaged_defrag());
+ if (!hpage) {
+ count_vm_event(THP_COLLAPSE_ALLOC_FAILED);
+ if (!*wait)
+ return NULL;
+
+ *wait = false;
+ khugepaged_alloc_sleep();
+ } else
+ count_vm_event(THP_COLLAPSE_ALLOC);
+ } while (unlikely(!hpage) && likely(khugepaged_enabled()));
+
+ return hpage;
+}
+
+static bool khugepaged_prealloc_page(struct page **hpage, bool *wait)
+{
+ if (!*hpage)
+ *hpage = khugepaged_alloc_hugepage(wait);
+
+ if (unlikely(!*hpage))
+ return false;
+
+ return true;
+}
+
+static struct page
+*khugepaged_alloc_page(struct page **hpage, struct mm_struct *mm,
+ struct vm_area_struct *vma, unsigned long address,
+ int node)
+{
+ up_read(&mm->mmap_sem);
+ VM_BUG_ON(!*hpage);
+ return *hpage;
+}
#endif
+static void collapse_huge_page(struct mm_struct *mm,
+ unsigned long address,
+ struct page **hpage,
+ struct vm_area_struct *vma,
+ int node)
+{
+ pgd_t *pgd;
+ pud_t *pud;
+ pmd_t *pmd, _pmd;
+ pte_t *pte;
+ pgtable_t pgtable;
+ struct page *new_page;
+ spinlock_t *ptl;
+ int isolated;
+ unsigned long hstart, hend;
+
+ VM_BUG_ON(address & ~HPAGE_PMD_MASK);
+
+ /* release the mmap_sem read lock. */
+ new_page = khugepaged_alloc_page(hpage, mm, vma, address, node);
+ if (!new_page)
+ return;
+
if (unlikely(mem_cgroup_newpage_charge(new_page, mm, GFP_KERNEL)))
return;
@@ -2230,34 +2302,6 @@ static int khugepaged_wait_event(void)
kthread_should_stop();
}
-static void khugepaged_alloc_sleep(void)
-{
- wait_event_freezable_timeout(khugepaged_wait, false,
- msecs_to_jiffies(khugepaged_alloc_sleep_millisecs));
-}
-
-#ifndef CONFIG_NUMA
-static struct page *khugepaged_alloc_hugepage(bool *wait)
-{
- struct page *hpage;
-
- do {
- hpage = alloc_hugepage(khugepaged_defrag());
- if (!hpage) {
- count_vm_event(THP_COLLAPSE_ALLOC_FAILED);
- if (!*wait)
- return NULL;
-
- *wait = false;
- khugepaged_alloc_sleep();
- } else
- count_vm_event(THP_COLLAPSE_ALLOC);
- } while (unlikely(!hpage) && likely(khugepaged_enabled()));
-
- return hpage;
-}
-#endif
-
static void khugepaged_do_scan(void)
{
struct page *hpage = NULL;
@@ -2268,23 +2312,9 @@ static void khugepaged_do_scan(void)
barrier(); /* write khugepaged_pages_to_scan to local stack */
while (progress < pages) {
-#ifndef CONFIG_NUMA
- if (!hpage)
- hpage = khugepaged_alloc_hugepage(&wait);
-
- if (unlikely(!hpage))
+ if (!khugepaged_prealloc_page(&hpage, &wait))
break;
-#else
- if (IS_ERR(hpage)) {
- if (!wait)
- break;
- wait = false;
- khugepaged_alloc_sleep();
- } else if (hpage) {
- put_page(hpage);
- hpage = NULL;
- }
-#endif
+
cond_resched();
if (unlikely(kthread_should_stop() || freezing(current)))
--
1.7.7.6
--
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