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From: | Vladimir Sementsov-Ogievskiy |
Subject: | Re: [PATCH v2 07/22] migration/block-dirty-bitmap: simplify dirty_bitmap_load_complete |
Date: | Wed, 19 Feb 2020 19:14:39 +0300 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.2.1 |
19.02.2020 18:30, Vladimir Sementsov-Ogievskiy wrote:
18.02.2020 17:26, Andrey Shinkevich wrote:On 17/02/2020 18:02, Vladimir Sementsov-Ogievskiy wrote:bdrv_enable_dirty_bitmap_locked() call does nothing, as if we are in postcopy, bitmap successor must be enabled, and reclaim operation will enable the bitmap. So, actually we need just call _reclaim_ in both if branches, and making differences only to add an assertion seems not really good. The logic becomes simple: on load complete we do reclaim and that's all. Signed-off-by: Vladimir Sementsov-Ogievskiy <address@hidden> --- migration/block-dirty-bitmap.c | 25 ++++--------------------- 1 file changed, 4 insertions(+), 21 deletions(-) diff --git a/migration/block-dirty-bitmap.c b/migration/block-dirty-bitmap.c index 440c41cfca..9cc750d93b 100644 --- a/migration/block-dirty-bitmap.c +++ b/migration/block-dirty-bitmap.c @@ -535,6 +535,10 @@ static void dirty_bitmap_load_complete(QEMUFile *f, DBMLoadState *s) qemu_mutex_lock(&s->lock); + if (bdrv_dirty_bitmap_has_successor(s->bitmap)) {What about making it sure? assert(!s->bitmap->successor->disabled);I'm afraid we can't as BdrvDirtyBitmap is not public structure+ bdrv_reclaim_dirty_bitmap(s->bitmap, &error_abort);But we can assert that resulting bitmap is enabled.
Or not, as bitmap may be not yet enabled, if guest is not yet started.
+ } + for (item = s->enabled_bitmaps; item; item = g_slist_next(item)) { LoadBitmapState *b = item->data; @@ -544,27 +548,6 @@ static void dirty_bitmap_load_complete(QEMUFile *f, DBMLoadState *s) } } - if (bdrv_dirty_bitmap_has_successor(s->bitmap)) { - bdrv_dirty_bitmap_lock(s->bitmap); - if (s->enabled_bitmaps == NULL) { - /* in postcopy */ - bdrv_reclaim_dirty_bitmap_locked(s->bitmap, &error_abort); - bdrv_enable_dirty_bitmap_locked(s->bitmap); - } else { - /* target not started, successor must be empty */ - int64_t count = bdrv_get_dirty_count(s->bitmap); - BdrvDirtyBitmap *ret = bdrv_reclaim_dirty_bitmap_locked(s->bitmap, - NULL); - /* bdrv_reclaim_dirty_bitmap can fail only on no successor (it - * must be) or on merge fail, but merge can't fail when second - * bitmap is empty - */ - assert(ret == s->bitmap && - count == bdrv_get_dirty_count(s->bitmap)); - } - bdrv_dirty_bitmap_unlock(s->bitmap); - } - qemu_mutex_unlock(&s->lock); }Reviewed-by: Andrey Shinkevich <address@hidden>
-- Best regards, Vladimir
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