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when cpus are paused (spinning) in DDB, call x86_pause() in the loop, 

hopefully this can reduce power usage while doing nothing.

ok chs@

XXX: pullup-*
XXX: apply to i386
This commit is contained in:
mrg 2023-07-31 02:38:16 +00:00
parent e3f649229b
commit 91637ac6c6
1 changed files with 3 additions and 3 deletions
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6
sys/arch/amd64/amd64/db_interface.c
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@ -1,4 +1,4 @@
/* $NetBSD: db_interface.c,v 1.41 2022/10/26 23:38:06 riastradh Exp $ */
/* $NetBSD: db_interface.c,v 1.42 2023/07/31 02:38:16 mrg Exp $ */
/*
* Mach Operating System
@ -33,7 +33,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: db_interface.c,v 1.41 2022/10/26 23:38:06 riastradh Exp $");
__KERNEL_RCSID(0, "$NetBSD: db_interface.c,v 1.42 2023/07/31 02:38:16 mrg Exp $");
#include "opt_ddb.h"
#include "opt_multiprocessor.h"
@ -303,7 +303,7 @@ ddb_suspend(struct trapframe *frame)
atomic_or_32(&ci->ci_flags, CPUF_PAUSE);
while (ci->ci_flags & CPUF_PAUSE)
;
x86_pause();
ci->ci_ddb_regs = 0;
tlbflushg();
}