Gitweb:     http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=ad1ede...
Commit:     ad1ede127760d6ca4903f44dfe1a8a38b3bfb36c
Parent:     0855b543222e79cbbd9d66dd56cb54740e7d524f
Author:     Andre Detsch <adetsch@br.ibm.com>
AuthorDate: Thu Jul 24 11:01:54 2008 +1000
Committer:  Jeremy Kerr <jk@ozlabs.org>
CommitDate: Thu Jul 24 11:01:54 2008 +1000

    powerpc/spufs: better placement of spu affinity reference context
    
    This patch adjusts the placement of a reference context from
    a spu affinity chain. The reference context can now be placed
    only on nodes that have enough spus not intended to be used by
    another gang (already running on the node).
    
    Signed-off-by: Andre Detsch <adetsch@br.ibm.com>
    Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
---
 arch/powerpc/platforms/cell/spufs/sched.c |   17 +++++++++++++++++
 1 files changed, 17 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/platforms/cell/spufs/sched.c b/arch/powerpc/platforms/cell/spufs/sched.c
index f293963..2deeeba 100644
--- a/arch/powerpc/platforms/cell/spufs/sched.c
+++ b/arch/powerpc/platforms/cell/spufs/sched.c
@@ -312,11 +312,28 @@ static struct spu *aff_ref_location(struct spu_context *ctx, int mem_aff,
 	 */
 	node = cpu_to_node(raw_smp_processor_id());
 	for (n = 0; n < MAX_NUMNODES; n++, node++) {
+		int available_spus;
+
 		node = (node < MAX_NUMNODES) ? node : 0;
 		if (!node_allowed(ctx, node))
 			continue;
+
+		available_spus = 0;
 		mutex_lock(&cbe_spu_info[node].list_mutex);
 		list_for_each_entry(spu, &cbe_spu_info[node].spus, cbe_list) {
+			if (spu->ctx && spu->ctx->gang
+					&& spu->ctx->aff_offset == 0)
+				available_spus -=
+					(spu->ctx->gang->contexts - 1);
+			else
+				available_spus++;
+		}
+		if (available_spus < ctx->gang->contexts) {
+			mutex_unlock(&cbe_spu_info[node].list_mutex);
+			continue;
+		}
+
+		list_for_each_entry(spu, &cbe_spu_info[node].spus, cbe_list) {
 			if ((!mem_aff || spu->has_mem_affinity) &&
 							sched_spu(spu)) {
 				mutex_unlock(&cbe_spu_info[node].list_mutex);
--
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