Piteball/android_kernel_samsung_msm8976
1
1
Fork 0
mirror of https://github.com/team-infusion-developers/android_kernel_samsung_msm8976.git synced 2024-10-31 18:09:19 +00:00
Code Issues Projects Releases Wiki Activity

ksm: make rmap walks more scalable

Browse source 
The rmap walks in ksm.c are like those in rmap.c: they can safely be
done with anon_vma_lock_read().

Signed-off-by: Hugh Dickins <hughd@google.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Hugh Dickins 2012-12-19 17:44:29 -08:00 committed by Linus Torvalds
parent 2832bc19f6
commit b6b19f25f6
1 changed files with 8 additions and 8 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

16
mm/ksm.c
View file

@ -1624,7 +1624,7 @@ again:
struct anon_vma_chain *vmac; struct anon_vma_chain *vmac;
struct vm_area_struct *vma; struct vm_area_struct *vma;
anon_vma_lock_write(anon_vma); anon_vma_lock_read(anon_vma);
anon_vma_interval_tree_foreach(vmac, &anon_vma->rb_root, anon_vma_interval_tree_foreach(vmac, &anon_vma->rb_root,
0, ULONG_MAX) { 0, ULONG_MAX) {
vma = vmac->vma; vma = vmac->vma;
@ -1648,7 +1648,7 @@ again:
if (!search_new_forks || !mapcount) if (!search_new_forks || !mapcount)
break; break;
} }
anon_vma_unlock(anon_vma); anon_vma_unlock_read(anon_vma);
if (!mapcount) if (!mapcount)
goto out; goto out;
} }
@ -1678,7 +1678,7 @@ again:
struct anon_vma_chain *vmac; struct anon_vma_chain *vmac;
struct vm_area_struct *vma; struct vm_area_struct *vma;
anon_vma_lock_write(anon_vma); anon_vma_lock_read(anon_vma);
anon_vma_interval_tree_foreach(vmac, &anon_vma->rb_root, anon_vma_interval_tree_foreach(vmac, &anon_vma->rb_root,
0, ULONG_MAX) { 0, ULONG_MAX) {
vma = vmac->vma; vma = vmac->vma;
@ -1697,11 +1697,11 @@ again:
ret = try_to_unmap_one(page, vma, ret = try_to_unmap_one(page, vma,
rmap_item->address, flags); rmap_item->address, flags);
if (ret != SWAP_AGAIN || !page_mapped(page)) { if (ret != SWAP_AGAIN || !page_mapped(page)) {
anon_vma_unlock(anon_vma); anon_vma_unlock_read(anon_vma);
goto out; goto out;
} }
} }
anon_vma_unlock(anon_vma); anon_vma_unlock_read(anon_vma);
} }
if (!search_new_forks++) if (!search_new_forks++)
goto again; goto again;
@ -1731,7 +1731,7 @@ again:
struct anon_vma_chain *vmac; struct anon_vma_chain *vmac;
struct vm_area_struct *vma; struct vm_area_struct *vma;
anon_vma_lock_write(anon_vma); anon_vma_lock_read(anon_vma);
anon_vma_interval_tree_foreach(vmac, &anon_vma->rb_root, anon_vma_interval_tree_foreach(vmac, &anon_vma->rb_root,
0, ULONG_MAX) { 0, ULONG_MAX) {
vma = vmac->vma; vma = vmac->vma;
@ -1749,11 +1749,11 @@ again:
ret = rmap_one(page, vma, rmap_item->address, arg); ret = rmap_one(page, vma, rmap_item->address, arg);
if (ret != SWAP_AGAIN) { if (ret != SWAP_AGAIN) {
anon_vma_unlock(anon_vma); anon_vma_unlock_read(anon_vma);
goto out; goto out;
} }
} }
anon_vma_unlock(anon_vma); anon_vma_unlock_read(anon_vma);
} }
if (!search_new_forks++) if (!search_new_forks++)
goto again; goto again;