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authorPaul Jackson <pj@sgi.com>2006-03-24 03:16:08 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-24 07:33:23 -0800
commitc61afb181c649754ea221f104e268cbacfc993e3 (patch)
tree870917b3f9175cf1663a2620d989856913cfb5f8 /include
parent101a50019ae5e370d73984ee05d56dd3b08f330a (diff)
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[PATCH] cpuset memory spread slab cache optimizations
The hooks in the slab cache allocator code path for support of NUMA mempolicies and cpuset memory spreading are in an important code path. Many systems will use neither feature. This patch optimizes those hooks down to a single check of some bits in the current tasks task_struct flags. For non NUMA systems, this hook and related code is already ifdef'd out. The optimization is done by using another task flag, set if the task is using a non-default NUMA mempolicy. Taking this flag bit along with the PF_SPREAD_PAGE and PF_SPREAD_SLAB flag bits added earlier in this 'cpuset memory spreading' patch set, one can check for the combination of any of these special case memory placement mechanisms with a single test of the current tasks task_struct flags. This patch also tightens up the code, to save a few bytes of kernel text space, and moves some of it out of line. Due to the nested inlines called from multiple places, we were ending up with three copies of this code, which once we get off the main code path (for local node allocation) seems a bit wasteful of instruction memory. Signed-off-by: Paul Jackson <pj@sgi.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/mempolicy.h5
-rw-r--r--include/linux/sched.h1
2 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/mempolicy.h b/include/linux/mempolicy.h
index bbd2221..6a7621b 100644
--- a/include/linux/mempolicy.h
+++ b/include/linux/mempolicy.h
@@ -147,6 +147,7 @@ extern void mpol_rebind_policy(struct mempolicy *pol, const nodemask_t *new);
extern void mpol_rebind_task(struct task_struct *tsk,
const nodemask_t *new);
extern void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new);
+extern void mpol_fix_fork_child_flag(struct task_struct *p);
#define set_cpuset_being_rebound(x) (cpuset_being_rebound = (x))
#ifdef CONFIG_CPUSET
@@ -248,6 +249,10 @@ static inline void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new)
{
}
+static inline void mpol_fix_fork_child_flag(struct task_struct *p)
+{
+}
+
#define set_cpuset_being_rebound(x) do {} while (0)
static inline struct zonelist *huge_zonelist(struct vm_area_struct *vma,
diff --git a/include/linux/sched.h b/include/linux/sched.h
index b0e37cf..2cda439 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -932,6 +932,7 @@ static inline void put_task_struct(struct task_struct *t)
#define PF_SWAPWRITE 0x01000000 /* Allowed to write to swap */
#define PF_SPREAD_PAGE 0x04000000 /* Spread page cache over cpuset */
#define PF_SPREAD_SLAB 0x08000000 /* Spread some slab caches over cpuset */
+#define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
/*
* Only the _current_ task can read/write to tsk->flags, but other