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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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fs/proc/task_mmu.c
+4 -2
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@@ -397,7 +397,8 @@ static int show_smap(struct seq_file *m, void *v)
"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, void *v)
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;