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| author | Peter Xu <peterx@redhat.com> | 2022-07-07 14:55:11 -0400 |
|---|---|---|
| committer | Dr. David Alan Gilbert <dgilbert@redhat.com> | 2022-07-20 12:15:08 +0100 |
| commit | c8750de11810ddca96026fc0edf87b64c1350f76 (patch) | |
| tree | 86c63105e081e08465ee8d93e849c2275b592f66 /migration/ram.c | |
| parent | d0edb8a173b54cae4571c9040c88cf0c5a1c6e12 (diff) | |
| download | qemu-c8750de11810ddca96026fc0edf87b64c1350f76.zip qemu-c8750de11810ddca96026fc0edf87b64c1350f76.tar.gz qemu-c8750de11810ddca96026fc0edf87b64c1350f76.tar.bz2 | |
migration: Add property x-postcopy-preempt-break-huge
Add a property field that can conditionally disable the "break sending huge
page" behavior in postcopy preemption. By default it's enabled.
It should only be used for debugging purposes, and we should never remove
the "x-" prefix.
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Manish Mishra <manish.mishra@nutanix.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <20220707185511.27366-1-peterx@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Diffstat (limited to 'migration/ram.c')
| -rw-r--r-- | migration/ram.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/migration/ram.c b/migration/ram.c index 65b08c4..7cbe9c3 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -2266,11 +2266,18 @@ static int ram_save_target_page(RAMState *rs, PageSearchStatus *pss) static bool postcopy_needs_preempt(RAMState *rs, PageSearchStatus *pss) { + MigrationState *ms = migrate_get_current(); + /* Not enabled eager preempt? Then never do that. */ if (!migrate_postcopy_preempt()) { return false; } + /* If the user explicitly disabled breaking of huge page, skip */ + if (!ms->postcopy_preempt_break_huge) { + return false; + } + /* If the ramblock we're sending is a small page? Never bother. */ if (qemu_ram_pagesize(pss->block) == TARGET_PAGE_SIZE) { return false; |