diff options
| author | Xiao Guangrong <xiaoguangrong@tencent.com> | 2018-03-30 15:51:19 +0800 |
|---|---|---|
| committer | Dr. David Alan Gilbert <dgilbert@redhat.com> | 2018-04-25 18:04:05 +0100 |
| commit | 263a289ae61c8344a417a95b0142650fdff3af56 (patch) | |
| tree | cba27ed923febc1b38e3c7846b5ceb434b03f2c7 /migration | |
| parent | 65ace060455122a461cdc9302238b914084bcd42 (diff) | |
| download | qemu-263a289ae61c8344a417a95b0142650fdff3af56.tar.gz | |
migration: stop compressing page in migration thread
As compression is a heavy work, do not do it in migration thread,
instead, we post it out as a normal page
Reviewed-by: Wei Wang <wei.w.wang@intel.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Xiao Guangrong <xiaoguangrong@tencent.com>
Message-Id: <20180330075128.26919-2-xiaoguangrong@tencent.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Diffstat (limited to 'migration')
| -rw-r--r-- | migration/ram.c | 32 |
1 files changed, 16 insertions, 16 deletions
diff --git a/migration/ram.c b/migration/ram.c index 0e90efa092..409c847a76 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -1137,7 +1137,7 @@ static int ram_save_compressed_page(RAMState *rs, PageSearchStatus *pss, int pages = -1; uint64_t bytes_xmit = 0; uint8_t *p; - int ret, blen; + int ret; RAMBlock *block = pss->block; ram_addr_t offset = pss->page << TARGET_PAGE_BITS; @@ -1167,23 +1167,23 @@ static int ram_save_compressed_page(RAMState *rs, PageSearchStatus *pss, if (block != rs->last_sent_block) { flush_compressed_data(rs); pages = save_zero_page(rs, block, offset); - if (pages == -1) { - /* Make sure the first page is sent out before other pages */ - bytes_xmit = save_page_header(rs, rs->f, block, offset | - RAM_SAVE_FLAG_COMPRESS_PAGE); - blen = qemu_put_compression_data(rs->f, p, TARGET_PAGE_SIZE, - migrate_compress_level()); - if (blen > 0) { - ram_counters.transferred += bytes_xmit + blen; - ram_counters.normal++; - pages = 1; - } else { - qemu_file_set_error(rs->f, blen); - error_report("compressed data failed!"); - } - } if (pages > 0) { ram_release_pages(block->idstr, offset, pages); + } else { + /* + * Make sure the first page is sent out before other pages. + * + * we post it as normal page as compression will take much + * CPU resource. + */ + ram_counters.transferred += save_page_header(rs, rs->f, block, + offset | RAM_SAVE_FLAG_PAGE); + qemu_put_buffer_async(rs->f, p, TARGET_PAGE_SIZE, + migrate_release_ram() & + migration_in_postcopy()); + ram_counters.transferred += TARGET_PAGE_SIZE; + ram_counters.normal++; + pages = 1; } } else { pages = save_zero_page(rs, block, offset); |