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mm: smaps: export mlock information

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Currently there is no way to find whether a process has locked its pages
in memory or not.  And which of the memory regions are locked in memory.

Add a new field "Locked" to export this information via the smaps file.

Signed-off-by: Nikanth Karthikesan <knikanth@suse.de>
Acked-by: Balbir Singh <balbir@linux.vnet.ibm.com>
Acked-by: Wu Fengguang <fengguang.wu@intel.com>
Cc: Matt Mackall <mpm@selenic.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Nikanth Karthikesan 2011-01-13 15:45:53 -08:00 committed by Linus Torvalds
parent 62c70bce8a
commit 2d90508f63
2 changed files with 8 additions and 2 deletions
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3
Documentation/filesystems/proc.txt
View File

@ -375,6 +375,7 @@ Anonymous: 0 kB
Swap: 0 kB Swap: 0 kB
KernelPageSize: 4 kB KernelPageSize: 4 kB
MMUPageSize: 4 kB MMUPageSize: 4 kB
Locked: 374 kB
The first of these lines shows the same information as is displayed for the The first of these lines shows the same information as is displayed for the
mapping in /proc/PID/maps. The remaining lines show the size of the mapping mapping in /proc/PID/maps. The remaining lines show the size of the mapping
@ -670,6 +671,8 @@ varies by architecture and compile options. The following is from a
> cat /proc/meminfo > cat /proc/meminfo
The "Locked" indicates whether the mapping is locked in memory or not.
MemTotal: 16344972 kB MemTotal: 16344972 kB
MemFree: 13634064 kB MemFree: 13634064 kB

7
fs/proc/task_mmu.c
View File

@ -418,7 +418,8 @@ static int show_smap(struct seq_file *m, void *v)
"Anonymous: %8lu kB\n" "Anonymous: %8lu kB\n"
"Swap: %8lu kB\n" "Swap: %8lu kB\n"
"KernelPageSize: %8lu kB\n" "KernelPageSize: %8lu kB\n"
"MMUPageSize: %8lu kB\n", "MMUPageSize: %8lu kB\n"
"Locked: %8lu kB\n",
(vma->vm_end - vma->vm_start) >> 10, (vma->vm_end - vma->vm_start) >> 10,
mss.resident >> 10, mss.resident >> 10,
(unsigned long)(mss.pss >> (10 + PSS_SHIFT)), (unsigned long)(mss.pss >> (10 + PSS_SHIFT)),
@ -430,7 +431,9 @@ static int show_smap(struct seq_file *m, void *v)
mss.anonymous >> 10, mss.anonymous >> 10,
mss.swap >> 10, mss.swap >> 10,
vma_kernel_pagesize(vma) >> 10, vma_kernel_pagesize(vma) >> 10,
vma_mmu_pagesize(vma) >> 10); vma_mmu_pagesize(vma) >> 10,
(vma->vm_flags & VM_LOCKED) ?
(unsigned long)(mss.pss >> (10 + PSS_SHIFT)) : 0);
if (m->count < m->size) /* vma is copied successfully */ if (m->count < m->size) /* vma is copied successfully */
m->version = (vma != get_gate_vma(task)) ? vma->vm_start : 0; m->version = (vma != get_gate_vma(task)) ? vma->vm_start : 0;