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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: Christian Krafft <krafft@de.ibm.com> Acked-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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2 changed files with 7 additions and 0 deletions
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@ -994,6 +994,7 @@ void spuctx_switch_state(struct spu_context *ctx,
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struct timespec ts;
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struct spu *spu;
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enum spu_utilization_state old_state;
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int node;
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ktime_get_ts(&ts);
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curtime = timespec_to_ns(&ts);
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@ -1015,6 +1016,11 @@ void spuctx_switch_state(struct spu_context *ctx,
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spu->stats.times[old_state] += delta;
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spu->stats.util_state = new_state;
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spu->stats.tstamp = curtime;
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node = spu->node;
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if (old_state == SPU_UTIL_USER)
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atomic_dec(&cbe_spu_info[node].busy_spus);
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if (new_state == SPU_UTIL_USER);
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atomic_inc(&cbe_spu_info[node].busy_spus);
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}
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}
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@ -191,6 +191,7 @@ struct cbe_spu_info {
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struct list_head spus;
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int n_spus;
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int nr_active;
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atomic_t busy_spus;
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atomic_t reserved_spus;
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};
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