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powerpc/spufs: add atomic busy_spus counter to struct cbe_spu_info

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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>
This commit is contained in:
Maxim Shchetynin 2008-07-05 05:05:39 +10:00 committed by Benjamin Herrenschmidt
parent 88b90c96b7
commit fabb657005
2 changed files with 7 additions and 0 deletions
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6
arch/powerpc/platforms/cell/spufs/sched.c
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@ -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);
}
}

1
include/asm-powerpc/spu.h
View File

@ -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;
};