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mm,vmacache: add debug data

Browse source 
Introduce a CONFIG_DEBUG_VM_VMACACHE option to enable counting the cache
hit rate -- exported in /proc/vmstat.

Any updates to the caching scheme needs this kind of data, thus it can
save some work re-implementing the counting all the time.

Signed-off-by: Davidlohr Bueso <[email protected]>
Cc: Aswin Chandramouleeswaran <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Davidlohr Bueso 2014-06-04 16:06:46 -07:00 • committed by Linus Torvalds
commit 4f115147ff
5 changed files with 34 additions and 2 deletions
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12
mm/vmacache.c
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@ -78,6 +78,8 @@ struct vm_area_struct *vmacache_find(struct mm_struct *mm, unsigned long addr)
if (!vmacache_valid(mm))
return NULL;
count_vm_vmacache_event(VMACACHE_FIND_CALLS);
for (i = 0; i < VMACACHE_SIZE; i++) {
struct vm_area_struct *vma = current->vmacache[i];
@ -85,8 +87,10 @@ struct vm_area_struct *vmacache_find(struct mm_struct *mm, unsigned long addr)
continue;
if (WARN_ON_ONCE(vma->vm_mm != mm))
break;
if (vma->vm_start <= addr && vma->vm_end > addr)
if (vma->vm_start <= addr && vma->vm_end > addr) {
count_vm_vmacache_event(VMACACHE_FIND_HITS);
return vma;
}
}
return NULL;
@ -102,11 +106,15 @@ struct vm_area_struct *vmacache_find_exact(struct mm_struct *mm,
if (!vmacache_valid(mm))
return NULL;
count_vm_vmacache_event(VMACACHE_FIND_CALLS);
for (i = 0; i < VMACACHE_SIZE; i++) {
struct vm_area_struct *vma = current->vmacache[i];
if (vma && vma->vm_start == start && vma->vm_end == end)
if (vma && vma->vm_start == start && vma->vm_end == end) {
count_vm_vmacache_event(VMACACHE_FIND_HITS);
return vma;
}
}
return NULL;