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retry timed out IPIs, complain and dump timing info into dmesg

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ok martin@
This commit is contained in:
macallan 2019-02-11 07:51:46 +00:00
parent 18110ad999
commit 93b767f377
1 changed files with 10 additions and 5 deletions
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15
sys/arch/sparc64/sparc64/vm_machdep.c
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@ -1,4 +1,4 @@
/* $NetBSD: vm_machdep.c,v 1.101 2015/11/06 15:30:59 martin Exp $ */
/* $NetBSD: vm_machdep.c,v 1.102 2019/02/11 07:51:46 macallan Exp $ */
/*
* Copyright (c) 1996-2002 Eduardo Horvath. All rights reserved.
@ -50,7 +50,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: vm_machdep.c,v 1.101 2015/11/06 15:30:59 martin Exp $");
__KERNEL_RCSID(0, "$NetBSD: vm_machdep.c,v 1.102 2019/02/11 07:51:46 macallan Exp $");
#include "opt_multiprocessor.h"
@ -305,12 +305,13 @@ fpusave_lwp(struct lwp *l, bool save)
}
for (ci = cpus; ci != NULL; ci = ci->ci_next) {
int spincount;
int spincount, retrycount=0;
if (ci == curcpu() || !CPUSET_HAS(cpus_active, ci->ci_index))
continue;
if (ci->ci_fplwp != l)
continue;
again:
sparc64_send_ipi(ci->ci_cpuid, save ?
sparc64_ipi_save_fpstate :
sparc64_ipi_drop_fpstate, (uintptr_t)l, 0);
@ -319,9 +320,13 @@ fpusave_lwp(struct lwp *l, bool save)
while (ci->ci_fplwp == l) {
membar_Sync();
spincount++;
if (spincount > 10000000)
panic("fpusave_lwp ipi didn't");
if (spincount > 10000000) {
printf("fpusave_lwp ipi didn't (%d)\n", retrycount);
retrycount++;
goto again;
}
}
if (retrycount > 0) printf("spincount %d\n", spincount);
break;
}
#else