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From 991ad76f13534cd2f22b30ba8b556f284f28c5c6 Mon Sep 17 00:00:00 2001
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From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
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Date: Fri, 22 Jun 2018 18:59:48 +0200
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Subject: [PATCH 09/57] migration: stop compressing page in migration thread
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RH-Author: Dr. David Alan Gilbert <dgilbert@redhat.com>
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Message-id: <20180622190005.21297-2-dgilbert@redhat.com>
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Patchwork-id: 81005
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O-Subject: [RHEL7.6 qemu-kvm-rhev PATCH 01/18] migration: stop compressing page in migration thread
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Bugzilla: 1584139
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RH-Acked-by: Juan Quintela <quintela@redhat.com>
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RH-Acked-by: Peter Xu <peterx@redhat.com>
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RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
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From: Xiao Guangrong <xiaoguangrong@tencent.com>
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As compression is a heavy work, do not do it in migration thread,
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instead, we post it out as a normal page
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Reviewed-by: Wei Wang <wei.w.wang@intel.com>
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Reviewed-by: Peter Xu <peterx@redhat.com>
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Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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Signed-off-by: Xiao Guangrong <xiaoguangrong@tencent.com>
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Message-Id: <20180330075128.26919-2-xiaoguangrong@tencent.com>
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Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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(cherry picked from commit 263a289ae61c8344a417a95b0142650fdff3af56)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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migration/ram.c | 32 ++++++++++++++++----------------
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1 file changed, 16 insertions(+), 16 deletions(-)
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diff --git a/migration/ram.c b/migration/ram.c
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index 00c06b5..f27038a 100644
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--- a/migration/ram.c
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+++ b/migration/ram.c
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@@ -1138,7 +1138,7 @@ static int ram_save_compressed_page(RAMState *rs, PageSearchStatus *pss,
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int pages = -1;
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uint64_t bytes_xmit = 0;
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uint8_t *p;
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- int ret, blen;
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+ int ret;
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RAMBlock *block = pss->block;
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ram_addr_t offset = pss->page << TARGET_PAGE_BITS;
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@@ -1168,23 +1168,23 @@ static int ram_save_compressed_page(RAMState *rs, PageSearchStatus *pss,
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if (block != rs->last_sent_block) {
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flush_compressed_data(rs);
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pages = save_zero_page(rs, block, offset);
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- if (pages == -1) {
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- /* Make sure the first page is sent out before other pages */
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- bytes_xmit = save_page_header(rs, rs->f, block, offset |
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- RAM_SAVE_FLAG_COMPRESS_PAGE);
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- blen = qemu_put_compression_data(rs->f, p, TARGET_PAGE_SIZE,
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- migrate_compress_level());
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- if (blen > 0) {
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- ram_counters.transferred += bytes_xmit + blen;
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- ram_counters.normal++;
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- pages = 1;
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- } else {
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- qemu_file_set_error(rs->f, blen);
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- error_report("compressed data failed!");
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- }
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- }
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if (pages > 0) {
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ram_release_pages(block->idstr, offset, pages);
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+ } else {
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+ /*
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+ * Make sure the first page is sent out before other pages.
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+ *
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+ * we post it as normal page as compression will take much
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+ * CPU resource.
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+ */
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+ ram_counters.transferred += save_page_header(rs, rs->f, block,
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+ offset | RAM_SAVE_FLAG_PAGE);
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+ qemu_put_buffer_async(rs->f, p, TARGET_PAGE_SIZE,
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+ migrate_release_ram() &
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+ migration_in_postcopy());
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+ ram_counters.transferred += TARGET_PAGE_SIZE;
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+ ram_counters.normal++;
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+ pages = 1;
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}
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} else {
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pages = save_zero_page(rs, block, offset);
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--
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1.8.3.1
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