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Commit fabb6570 authored by Maxim Shchetynin's avatar Maxim Shchetynin Committed by Benjamin Herrenschmidt
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powerpc/spufs: add atomic busy_spus counter to struct cbe_spu_info 



As nr_active counter includes also spus waiting for syscalls to return
we need a seperate counter that only counts spus that are currently running
on spu side. This counter shall be used by a cpufreq governor that targets
a frequency dependent from the number of running spus.

Signed-off-by: default avatarChristian Krafft <krafft@de.ibm.com>
Acked-by: default avatarJeremy Kerr <jk@ozlabs.org>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent 88b90c96

arch/powerpc/platforms/cell/spufs/sched.c

+6 −0
Original line number Diff line number Diff line
@@ -994,6 +994,7 @@ void spuctx_switch_state(struct spu_context *ctx, 
	struct timespec ts;

	struct spu *spu;

	enum spu_utilization_state old_state;

	int node;



	ktime_get_ts(&ts);

	curtime = timespec_to_ns(&ts);
@@ -1015,6 +1016,11 @@ void spuctx_switch_state(struct spu_context *ctx, 
		spu->stats.times[old_state] += delta;

		spu->stats.util_state = new_state;

		spu->stats.tstamp = curtime;

		node = spu->node;

		if (old_state == SPU_UTIL_USER)

			atomic_dec(&cbe_spu_info[node].busy_spus);

		if (new_state == SPU_UTIL_USER);

			atomic_inc(&cbe_spu_info[node].busy_spus);

	}

}

include/asm-powerpc/spu.h

+1 −0
Original line number Diff line number Diff line
@@ -191,6 +191,7 @@ struct cbe_spu_info { 
	struct list_head spus;

	int n_spus;

	int nr_active;

	atomic_t busy_spus;

	atomic_t reserved_spus;

};