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migration/postcopy: Add blocktime fault counts per-vcpu

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Add a field to count how many remote faults one vCPU has taken.  So far
it's still not used, but will be soon.

Reviewed-by: Fabiano Rosas <farosas@suse.de>
Link: https://lore.kernel.org/r/20250613141217.474825-8-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Fabiano Rosas <farosas@suse.de>
This commit is contained in:
Peter Xu
2025-07-11 10:37:38 -03:00
committed by Fabiano Rosas
parent a098761f63
commit 271a1940e9
1 changed files with 5 additions and 0 deletions
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migration/postcopy-ram.c
+5
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@@ -116,6 +116,8 @@ typedef struct PostcopyBlocktimeContext {
uint64_t *vcpu_blocktime_start;
/* blocktime per vCPU */
uint64_t *vcpu_blocktime_total;
/* count of faults per vCPU */
uint64_t *vcpu_faults_count;
/* page address per vCPU */
uintptr_t *vcpu_addr;
/* total blocktime when all vCPUs are stopped */
@@ -136,6 +138,7 @@ static void destroy_blocktime_context(struct PostcopyBlocktimeContext *ctx)
{
g_free(ctx->vcpu_blocktime_start);
g_free(ctx->vcpu_blocktime_total);
g_free(ctx->vcpu_faults_count);
g_free(ctx->vcpu_addr);
g_free(ctx);
}
@@ -155,6 +158,7 @@ static struct PostcopyBlocktimeContext *blocktime_context_new(void)
ctx->vcpu_blocktime_start = g_new0(uint64_t, smp_cpus);
ctx->vcpu_blocktime_total = g_new0(uint64_t, smp_cpus);
ctx->vcpu_faults_count = g_new0(uint64_t, smp_cpus);
ctx->vcpu_addr = g_new0(uintptr_t, smp_cpus);
ctx->exit_notifier.notify = migration_exit_cb;
qemu_add_exit_notifier(&ctx->exit_notifier);
@@ -857,6 +861,7 @@ void mark_postcopy_blocktime_begin(uintptr_t addr, uint32_t ptid,
dc->last_begin = current;
dc->vcpu_blocktime_start[cpu] = current;
dc->vcpu_addr[cpu] = addr;
dc->vcpu_faults_count[cpu]++;
/*
* The caller should only inject a blocktime entry when the page is