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[PATCH] spufs: Improved SPU preemptability.

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This patch makes it easier to preempt an SPU context by
having the scheduler hold ctx->state_sema for much shorter
periods of time.

As part of this restructuring, the control logic for the "run"
operation is moved from arch/ppc64/kernel/spu_base.c to
fs/spufs/file.c.  Of course the base retains "bottom half"
handlers for class{0,1} irqs.  The new run loop will re-acquire
an SPU if preempted.

From: Mark Nutter <mnutter@us.ibm.com>
Signed-off-by: Arnd Bergmann <arndb@de.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Arnd Bergmann
2005-12-05 22:52:25 -05:00
committed by Paul Mackerras
parent 3b3d22cb84
commit 5110459f18
8 changed files with 206 additions and 124 deletions
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5
include/asm-powerpc/spu.h
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@@ -135,9 +135,9 @@ struct spu {
spinlock_t register_lock;
u32 stop_code;
wait_queue_head_t stop_wq;
void (* wbox_callback)(struct spu *spu);
void (* ibox_callback)(struct spu *spu);
void (* stop_callback)(struct spu *spu);
char irq_c0[8];
char irq_c1[8];
@@ -146,7 +146,8 @@ struct spu {
struct spu *spu_alloc(void);
void spu_free(struct spu *spu);
int spu_run(struct spu *spu);
int spu_irq_class_0_bottom(struct spu *spu);
int spu_irq_class_1_bottom(struct spu *spu);
extern struct spufs_calls {
asmlinkage long (*create_thread)(const char __user *name,