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| author | Liang Li <liang.z.li@intel.com> | 2016-05-05 15:32:55 +0800 |
|---|---|---|
| committer | Amit Shah <amit.shah@redhat.com> | 2016-06-17 18:24:21 +0530 |
| commit | fc50438ed0b7106542048d70686ee4b1c340ea49 (patch) | |
| tree | e9110d252fd8bdf4c2469854fe3b9398b65688d9 /migration | |
| parent | b3be28969b797b27d7f7f806827e9898e4ee08f0 (diff) | |
| download | qemu-fc50438ed0b7106542048d70686ee4b1c340ea49.tar.gz qemu-fc50438ed0b7106542048d70686ee4b1c340ea49.tar.bz2 qemu-fc50438ed0b7106542048d70686ee4b1c340ea49.zip | |
migration: refine ram_save_compressed_page
Use qemu_put_compression_data to do the compression directly
instead of using do_compress_ram_page, avoid some data copy.
very small improvement, at the same time, add code to check
if the compression is successful.
Signed-off-by: Liang Li <liang.z.li@intel.com>
Message-Id: <1462433579-13691-6-git-send-email-liang.z.li@intel.com>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Diffstat (limited to 'migration')
| -rw-r--r-- | migration/ram.c | 27 |
1 files changed, 13 insertions, 14 deletions
diff --git a/migration/ram.c b/migration/ram.c index d30c923195..9e4f5e5efc 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -929,24 +929,20 @@ static int ram_save_compressed_page(QEMUFile *f, PageSearchStatus *pss, uint64_t *bytes_transferred) { int pages = -1; - uint64_t bytes_xmit; + uint64_t bytes_xmit = 0; uint8_t *p; - int ret; + int ret, blen; RAMBlock *block = pss->block; ram_addr_t offset = pss->offset; p = block->host + offset; - bytes_xmit = 0; ret = ram_control_save_page(f, block->offset, offset, TARGET_PAGE_SIZE, &bytes_xmit); if (bytes_xmit) { *bytes_transferred += bytes_xmit; pages = 1; } - if (block == last_sent_block) { - offset |= RAM_SAVE_FLAG_CONTINUE; - } if (ret != RAM_SAVE_CONTROL_NOT_SUPP) { if (ret != RAM_SAVE_CONTROL_DELAYED) { if (bytes_xmit > 0) { @@ -966,19 +962,22 @@ static int ram_save_compressed_page(QEMUFile *f, PageSearchStatus *pss, flush_compressed_data(f); pages = save_zero_page(f, block, offset, p, bytes_transferred); if (pages == -1) { - set_compress_params(&comp_param[0], block, offset); - /* Use the qemu thread to compress the data to make sure the - * first page is sent out before other pages - */ - bytes_xmit = do_compress_ram_page(&comp_param[0]); - if (bytes_xmit > 0) { + /* Make sure the first page is sent out before other pages */ + bytes_xmit = save_page_header(f, block, offset | + RAM_SAVE_FLAG_COMPRESS_PAGE); + blen = qemu_put_compression_data(f, p, TARGET_PAGE_SIZE, + migrate_compress_level()); + if (blen > 0) { + *bytes_transferred += bytes_xmit + blen; acct_info.norm_pages++; - qemu_put_qemu_file(f, comp_param[0].file); - *bytes_transferred += bytes_xmit; pages = 1; + } else { + qemu_file_set_error(f, blen); + error_report("compressed data failed!"); } } } else { + offset |= RAM_SAVE_FLAG_CONTINUE; pages = save_zero_page(f, block, offset, p, bytes_transferred); if (pages == -1) { pages = compress_page_with_multi_thread(f, block, offset, |