The patch titled
mm: report the MMU pagesize in /proc/pid/smaps
has been added to the -mm tree. Its filename is
mm-report-the-mmu-pagesize-in-proc-pid-smaps.patch
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The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: mm: report the MMU pagesize in /proc/pid/smaps
From: Mel Gorman <mel@xxxxxxxxx>
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@xxxxxxxxx>
Cc: "KOSAKI Motohiro" <kosaki.motohiro@xxxxxxxxxxxxxx>
Cc: Alexey Dobriyan <adobriyan@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/powerpc/include/asm/hugetlb.h | 6 ++++++
arch/powerpc/mm/hugetlbpage.c | 7 +++++++
fs/proc/task_mmu.c | 6 ++++--
include/linux/hugetlb.h | 3 +++
mm/hugetlb.c | 13 +++++++++++++
5 files changed, 33 insertions(+), 2 deletions(-)
diff -puN arch/powerpc/include/asm/hugetlb.h~mm-report-the-mmu-pagesize-in-proc-pid-smaps arch/powerpc/include/asm/hugetlb.h
--- a/arch/powerpc/include/asm/hugetlb.h~mm-report-the-mmu-pagesize-in-proc-pid-smaps
+++ a/arch/powerpc/include/asm/hugetlb.h
@@ -18,6 +18,12 @@ pte_t huge_ptep_get_and_clear(struct mm_
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.
*/
diff -puN arch/powerpc/mm/hugetlbpage.c~mm-report-the-mmu-pagesize-in-proc-pid-smaps arch/powerpc/mm/hugetlbpage.c
--- a/arch/powerpc/mm/hugetlbpage.c~mm-report-the-mmu-pagesize-in-proc-pid-smaps
+++ a/arch/powerpc/mm/hugetlbpage.c
@@ -510,6 +510,13 @@ unsigned long hugetlb_get_unmapped_area(
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
*/
diff -puN fs/proc/task_mmu.c~mm-report-the-mmu-pagesize-in-proc-pid-smaps fs/proc/task_mmu.c
--- a/fs/proc/task_mmu.c~mm-report-the-mmu-pagesize-in-proc-pid-smaps
+++ a/fs/proc/task_mmu.c
@@ -397,7 +397,8 @@ static int show_smap(struct seq_file *m,
"Private_Dirty: %8lu kB\n"
"Referenced: %8lu kB\n"
"Swap: %8lu kB\n"
- "KernelPageSize: %8lu kB\n",
+ "KernelPageSize: %8lu kB\n"
+ "MMUPageSize: %8lu kB\n",
(vma->vm_end - vma->vm_start) >> 10,
mss.resident >> 10,
(unsigned long)(mss.pss >> (10 + PSS_SHIFT)),
@@ -407,7 +408,8 @@ static int show_smap(struct seq_file *m,
mss.private_dirty >> 10,
mss.referenced >> 10,
mss.swap >> 10,
- vma_kernel_pagesize(vma) >> 10);
+ vma_kernel_pagesize(vma) >> 10,
+ vma_mmu_pagesize(vma) >> 10);
if (m->count < m->size) /* vma is copied successfully */
m->version = (vma != get_gate_vma(task)) ? vma->vm_start : 0;
diff -puN include/linux/hugetlb.h~mm-report-the-mmu-pagesize-in-proc-pid-smaps include/linux/hugetlb.h
--- a/include/linux/hugetlb.h~mm-report-the-mmu-pagesize-in-proc-pid-smaps
+++ a/include/linux/hugetlb.h
@@ -235,6 +235,8 @@ static inline unsigned long huge_page_si
extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
+extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
+
static inline unsigned long huge_page_mask(struct hstate *h)
{
return h->mask;
@@ -276,6 +278,7 @@ struct hstate {};
#define huge_page_size(h) PAGE_SIZE
#define huge_page_mask(h) PAGE_MASK
#define vma_kernel_pagesize(v) PAGE_SIZE
+#define vma_mmu_pagesize(v) PAGE_SIZE
#define huge_page_order(h) 0
#define huge_page_shift(h) PAGE_SHIFT
static inline unsigned int pages_per_huge_page(struct hstate *h)
diff -puN mm/hugetlb.c~mm-report-the-mmu-pagesize-in-proc-pid-smaps mm/hugetlb.c
--- a/mm/hugetlb.c~mm-report-the-mmu-pagesize-in-proc-pid-smaps
+++ a/mm/hugetlb.c
@@ -236,6 +236,19 @@ unsigned long vma_kernel_pagesize(struct
}
/*
+ * Return the page size being used by the MMU to back a VMA. In the majority
+ * of cases, the page size used by the kernel matches the MMU size. On
+ * architectures where it differs, an architecture-specific version of this
+ * function is required.
+ */
+#ifndef vma_mmu_pagesize
+unsigned long vma_mmu_pagesize(struct vm_area_struct *vma)
+{
+ return vma_kernel_pagesize(vma);
+}
+#endif
+
+/*
* Flags for MAP_PRIVATE reservations. These are stored in the bottom
* bits of the reservation map pointer, which are always clear due to
* alignment.
_
Patches currently in -mm which might be from mel@xxxxxxxxx are
origin.patch
mm-report-the-pagesize-backing-a-vma-in-proc-pid-smaps.patch
mm-report-the-mmu-pagesize-in-proc-pid-smaps.patch
mm-cleanup-to-make-remove_memory-arch-neutral-fix-fix.patch
page-owner-tracking-leak-detector.patch
add-debugging-aid-for-memory-initialisation-problems.patch
--
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