[POWERPC] spufs: Add stat file to spufs
Export per-context statistics in spufs.
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>
diff --git a/arch/powerpc/platforms/cell/spufs/spufs.h b/arch/powerpc/platforms/cell/spufs/spufs.h
index 7f5d0b2..cd2b54f 100644
--- a/arch/powerpc/platforms/cell/spufs/spufs.h
+++ b/arch/powerpc/platforms/cell/spufs/spufs.h
@@ -40,6 +40,19 @@
struct spu_context_ops;
struct spu_gang;
+/*
+ * This is the state for spu utilization reporting to userspace.
+ * Because this state is visible to userspace it must never change and needs
+ * to be kept strictly separate from any internal state kept by the kernel.
+ */
+enum spuctx_execution_state {
+ SPUCTX_UTIL_USER = 0,
+ SPUCTX_UTIL_SYSTEM,
+ SPUCTX_UTIL_IOWAIT,
+ SPUCTX_UTIL_LOADED,
+ SPUCTX_UTIL_MAX
+};
+
struct spu_context {
struct spu *spu; /* pointer to a physical SPU */
struct spu_state csa; /* SPU context save area. */
@@ -87,6 +100,24 @@
cpumask_t cpus_allowed;
int policy;
int prio;
+
+ /* statistics */
+ struct {
+ /* updates protected by ctx->state_mutex */
+ enum spuctx_execution_state execution_state;
+ unsigned long tstamp; /* time of last ctx switch */
+ unsigned long times[SPUCTX_UTIL_MAX];
+ unsigned long long vol_ctx_switch;
+ unsigned long long invol_ctx_switch;
+ unsigned long long min_flt;
+ unsigned long long maj_flt;
+ unsigned long long hash_flt;
+ unsigned long long slb_flt;
+ unsigned long long slb_flt_base; /* # at last ctx switch */
+ unsigned long long class2_intr;
+ unsigned long long class2_intr_base; /* # at last ctx switch */
+ unsigned long long libassist;
+ } stats;
};
struct spu_gang {
@@ -256,4 +287,24 @@
extern struct spufs_coredump_reader spufs_coredump_read[];
extern int spufs_coredump_num_notes;
+/*
+ * This function is a little bit too large for an inline, but
+ * as fault.c is built into the kernel we can't move it out of
+ * line.
+ */
+static inline void spuctx_switch_state(struct spu_context *ctx,
+ enum spuctx_execution_state new_state)
+{
+ WARN_ON(!mutex_is_locked(&ctx->state_mutex));
+
+ if (ctx->stats.execution_state != new_state) {
+ unsigned long curtime = jiffies;
+
+ ctx->stats.times[ctx->stats.execution_state] +=
+ curtime - ctx->stats.tstamp;
+ ctx->stats.tstamp = curtime;
+ ctx->stats.execution_state = new_state;
+ }
+}
+
#endif