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migration: Enable UFFD_FEATURE_THREAD_ID even without blocktime feat

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This patch allows us to read the tid even without blocktime feature enabled.
It's useful when tracing postcopy fault thread on faulted pages to show thread
id too with the address.

Remove the comments - they're merely not helpful at all.

Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Peter Xu 2022-01-19 16:09:17 +08:00 • committed by Juan Quintela
parent 258f5c9825
commit 2d1c37c603
1 changed files with 6 additions and 8 deletions
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14
migration/postcopy-ram.c
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@ -283,15 +283,13 @@ static bool ufd_check_and_apply(int ufd, MigrationIncomingState *mis)
}
#ifdef UFFD_FEATURE_THREAD_ID
if (migrate_postcopy_blocktime() && mis &&
UFFD_FEATURE_THREAD_ID & supported_features) {
/* kernel supports that feature */
/* don't create blocktime_context if it exists */
if (!mis->blocktime_ctx) {
mis->blocktime_ctx = blocktime_context_new();
}
if (UFFD_FEATURE_THREAD_ID & supported_features) {
asked_features |= UFFD_FEATURE_THREAD_ID;
if (migrate_postcopy_blocktime()) {
if (!mis->blocktime_ctx) {
mis->blocktime_ctx = blocktime_context_new();
}
}
}
#endif