From 29c59172015b24b442b2d85fa3b2382e262f3d74 Mon Sep 17 00:00:00 2001 From: "Dr. David Alan Gilbert" Date: Fri, 24 Feb 2017 18:28:31 +0000 Subject: [PATCH] postcopy: Chunk discards for hugepages At the start of the postcopy phase, partially sent huge pages must be discarded. The code for dealing with host page sizes larger than the target page size can be reused for this case. Signed-off-by: Dr. David Alan Gilbert Reviewed-by: Juan Quintela Reviewed-by: Laurent Vivier Message-Id: <20170224182844.32452-4-dgilbert@redhat.com> Signed-off-by: Dr. David Alan Gilbert --- migration/ram.c | 17 +++++++++-------- 1 file changed, 9 insertions(+), 8 deletions(-) diff --git a/migration/ram.c b/migration/ram.c index fbd987a340..7c5cdf98c9 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -1672,12 +1672,17 @@ static void postcopy_chunk_hostpages_pass(MigrationState *ms, bool unsent_pass, { unsigned long *bitmap; unsigned long *unsentmap; - unsigned int host_ratio = qemu_host_page_size / TARGET_PAGE_SIZE; + unsigned int host_ratio = block->page_size / TARGET_PAGE_SIZE; unsigned long first = block->offset >> TARGET_PAGE_BITS; unsigned long len = block->used_length >> TARGET_PAGE_BITS; unsigned long last = first + (len - 1); unsigned long run_start; + if (block->page_size == TARGET_PAGE_SIZE) { + /* Easy case - TPS==HPS for a non-huge page RAMBlock */ + return; + } + bitmap = atomic_rcu_read(&migration_bitmap_rcu)->bmap; unsentmap = atomic_rcu_read(&migration_bitmap_rcu)->unsentmap; @@ -1781,7 +1786,8 @@ static void postcopy_chunk_hostpages_pass(MigrationState *ms, bool unsent_pass, * Utility for the outgoing postcopy code. * * Discard any partially sent host-page size chunks, mark any partially - * dirty host-page size chunks as all dirty. + * dirty host-page size chunks as all dirty. In this case the host-page + * is the host-page for the particular RAMBlock, i.e. it might be a huge page * * Returns: 0 on success */ @@ -1789,11 +1795,6 @@ static int postcopy_chunk_hostpages(MigrationState *ms) { struct RAMBlock *block; - if (qemu_host_page_size == TARGET_PAGE_SIZE) { - /* Easy case - TPS==HPS - nothing to be done */ - return 0; - } - /* Easiest way to make sure we don't resume in the middle of a host-page */ last_seen_block = NULL; last_sent_block = NULL; @@ -1849,7 +1850,7 @@ int ram_postcopy_send_discard_bitmap(MigrationState *ms) return -EINVAL; } - /* Deal with TPS != HPS */ + /* Deal with TPS != HPS and huge pages */ ret = postcopy_chunk_hostpages(ms); if (ret) { rcu_read_unlock();