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thp: release page in page pre-alloc path

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If NUMA is enabled, we can release the page in the page pre-alloc
operation, then the CONFIG_NUMA dependent code can be reduced

Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Xiao Guangrong 2012-10-08 16:29:49 -07:00 committed by Linus Torvalds
parent d516904bd2
commit 420256ef02
1 changed files with 7 additions and 12 deletions
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19
mm/huge_memory.c
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@ -1873,15 +1873,12 @@ static void collapse_huge_page(struct mm_struct *mm,
*hpage = ERR_PTR(-ENOMEM);
return;
}
*hpage = new_page;
count_vm_event(THP_COLLAPSE_ALLOC);
#endif
if (unlikely(mem_cgroup_newpage_charge(new_page, mm, GFP_KERNEL))) {
#ifdef CONFIG_NUMA
put_page(new_page);
#endif
if (unlikely(mem_cgroup_newpage_charge(new_page, mm, GFP_KERNEL)))
return;
}
/*
* Prevent all access to pagetables with the exception of
@ -1982,9 +1979,8 @@ static void collapse_huge_page(struct mm_struct *mm,
prepare_pmd_huge_pte(pgtable, mm);
spin_unlock(&mm->page_table_lock);
#ifndef CONFIG_NUMA
*hpage = NULL;
#endif
khugepaged_pages_collapsed++;
out_up_write:
up_write(&mm->mmap_sem);
@ -1992,9 +1988,6 @@ out_up_write:
out:
mem_cgroup_uncharge_page(new_page);
#ifdef CONFIG_NUMA
put_page(new_page);
#endif
goto out_up_write;
}
@ -2260,8 +2253,6 @@ static void khugepaged_do_scan(void)
barrier(); /* write khugepaged_pages_to_scan to local stack */
while (progress < pages) {
cond_resched();
#ifndef CONFIG_NUMA
if (!hpage)
hpage = khugepaged_alloc_hugepage(&wait);
@ -2274,8 +2265,12 @@ static void khugepaged_do_scan(void)
break;
wait = false;
khugepaged_alloc_sleep();
} else if (hpage) {
put_page(hpage);
hpage = NULL;
}
#endif
cond_resched();
if (unlikely(kthread_should_stop() || freezing(current)))
break;