[POWERPC] spufs: Implement /proc/spu_loadavg

Provide load average information for spu context.  The format
is identical to /proc/loadavg, which is also where a lot of code
and concepts is borrowed from.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/cell/spufs/context.c b/arch/powerpc/platforms/cell/spufs/context.c
index 6ff2a75589f3..f623d963fdc7 100644
--- a/arch/powerpc/platforms/cell/spufs/context.c
+++ b/arch/powerpc/platforms/cell/spufs/context.c
@@ -23,10 +23,14 @@
 #include <linux/fs.h>
 #include <linux/mm.h>
 #include <linux/slab.h>
+#include <asm/atomic.h>
 #include <asm/spu.h>
 #include <asm/spu_csa.h>
 #include "spufs.h"
 
+
+atomic_t nr_spu_contexts = ATOMIC_INIT(0);
+
 struct spu_context *alloc_spu_context(struct spu_gang *gang)
 {
         struct spu_context *ctx;
@@ -55,6 +59,8 @@ struct spu_context *alloc_spu_context(struct spu_gang *gang)
                 spu_gang_add_ctx(gang, ctx);
         ctx->cpus_allowed = current->cpus_allowed;
         spu_set_timeslice(ctx);
+
+        atomic_inc(&nr_spu_contexts);
         goto out;
 out_free:
         kfree(ctx);
@@ -74,6 +80,7 @@ void destroy_spu_context(struct kref *kref)
         if (ctx->gang)
                 spu_gang_remove_ctx(ctx->gang, ctx);
         BUG_ON(!list_empty(&ctx->rq));
+        atomic_dec(&nr_spu_contexts);
         kfree(ctx);
 }