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mm: report the MMU pagesize in /proc/pid/smaps

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The KernelPageSize entry in /proc/pid/smaps is the pagesize used by the
kernel to back a VMA.  This matches the size used by the MMU in the
majority of cases.  However, one counter-example occurs on PPC64 kernels
whereby a kernel using 64K as a base pagesize may still use 4K pages for
the MMU on older processor.  To distinguish, this patch reports
MMUPageSize as the pagesize used by the MMU in /proc/pid/smaps.

Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Cc: "KOSAKI Motohiro" <kosaki.motohiro@jp.fujitsu.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mel Gorman
2009-01-06 14:38:54 -08:00
committed by Linus Torvalds
parent 08fba69986
commit 3340289ddf
5 changed files with 33 additions and 2 deletions
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6
arch/powerpc/include/asm/hugetlb.h
View File

@@ -17,6 +17,12 @@ void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
pte_t *ptep);
/*
* The version of vma_mmu_pagesize() in arch/powerpc/mm/hugetlbpage.c needs
* to override the version in mm/hugetlb.c
*/
#define vma_mmu_pagesize vma_mmu_pagesize
/*
* If the arch doesn't supply something else, assume that hugepage
* size aligned regions are ok without further preparation.

7
arch/powerpc/mm/hugetlbpage.c
View File

@@ -512,6 +512,13 @@ unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
return slice_get_unmapped_area(addr, len, flags, mmu_psize, 1, 0);
}
unsigned long vma_mmu_pagesize(struct vm_area_struct *vma)
{
unsigned int psize = get_slice_psize(vma->vm_mm, vma->vm_start);
return 1UL << mmu_psize_to_shift(psize);
}
/*
* Called by asm hashtable.S for doing lazy icache flush
*/