path: root/Documentation/cachetlb.txt
diff options
authorKOSAKI Motohiro <>2011-05-24 17:12:15 -0700
committerLinus Torvalds <>2011-05-25 08:39:21 -0700
commitde03c72cfce5b263a674d04348b58475ec50163c (patch)
treee2b035234440bcd1aa88078c3f9c8457d461ef9c /Documentation/cachetlb.txt
parent692e0b35427a088bf75d9363788c61c7edbe93a5 (diff)
mm: convert mm->cpu_vm_cpumask into cpumask_var_t
cpumask_t is very big struct and cpu_vm_mask is placed wrong position. It might lead to reduce cache hit ratio. This patch has two change. 1) Move the place of cpumask into last of mm_struct. Because usually cpumask is accessed only front bits when the system has cpu-hotplug capability 2) Convert cpu_vm_mask into cpumask_var_t. It may help to reduce memory footprint if cpumask_size() will use nr_cpumask_bits properly in future. In addition, this patch change the name of cpu_vm_mask with cpu_vm_mask_var. It may help to detect out of tree cpu_vm_mask users. This patch has no functional change. [ build fix] [ coding-style fixes] Signed-off-by: KOSAKI Motohiro <> Cc: David Howells <> Cc: Koichi Yasutake <> Cc: Hugh Dickins <> Cc: Chris Metcalf <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
Diffstat (limited to 'Documentation/cachetlb.txt')
1 files changed, 1 insertions, 1 deletions
diff --git a/Documentation/cachetlb.txt b/Documentation/cachetlb.txt
index 9164ae3b83bc..9b728dc17535 100644
--- a/Documentation/cachetlb.txt
+++ b/Documentation/cachetlb.txt
@@ -16,7 +16,7 @@ on all processors in the system. Don't let this scare you into
thinking SMP cache/tlb flushing must be so inefficient, this is in
fact an area where many optimizations are possible. For example,
if it can be proven that a user address space has never executed
-on a cpu (see vma->cpu_vm_mask), one need not perform a flush
+on a cpu (see mm_cpumask()), one need not perform a flush
for this address space on that cpu.
First, the TLB flushing interfaces, since they are the simplest. The