Commit 2d90508f authored by Nikanth Karthikesan's avatar Nikanth Karthikesan Committed by Linus Torvalds
Browse files

mm: smaps: export mlock information 



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: default avatarNikanth Karthikesan <knikanth@suse.de>
Acked-by: default avatarBalbir Singh <balbir@linux.vnet.ibm.com>
Acked-by: default avatarWu Fengguang <fengguang.wu@intel.com>
Cc: Matt Mackall <mpm@selenic.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 62c70bce

Documentation/filesystems/proc.txt

+3 −0
Original line number Diff line number Diff line
@@ -375,6 +375,7 @@ Anonymous: 0 kB 
Swap:                  0 kB

KernelPageSize:        4 kB

MMUPageSize:           4 kB

Locked:              374 kB



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
@@ -670,6 +671,8 @@ varies by architecture and compile options. The following is from a 


> cat /proc/meminfo



The "Locked" indicates whether the mapping is locked in memory or not.





MemTotal:     16344972 kB

MemFree:      13634064 kB

fs/proc/task_mmu.c

+5 −2
Original line number Diff line number Diff line
@@ -418,7 +418,8 @@ static int show_smap(struct seq_file *m, void *v) 
		   "Anonymous:      %8lu kB\n"

		   "Swap:           %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,

		   mss.resident >> 10,

		   (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.swap >> 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 */

		m->version = (vma != get_gate_vma(task)) ? vma->vm_start : 0;

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