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X-Received-From: 134.134.136.24 Subject: [Qemu-devel] [RFC PATCH] migration/postcopy: enable compress with postcopy X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Wei Yang , dgilbert@redhat.com, quintela@redhat.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" This patch enable compress with postcopy. This is a RFC and based on some unmerged patch "migration: extract ram_load_precopy" "migration/postcopy: skip compression when postcopy is active" Signed-off-by: Wei Yang --- migration/postcopy-ram.c | 3 +-- migration/ram.c | 35 +++++++++++++++++++++-------------- 2 files changed, 22 insertions(+), 16 deletions(-) diff --git a/migration/postcopy-ram.c b/migration/postcopy-ram.c index a7e7ec9c22..70b6beb5a9 100644 --- a/migration/postcopy-ram.c +++ b/migration/postcopy-ram.c @@ -1252,8 +1252,7 @@ int postcopy_place_page_zero(MigrationIncomingState *= mis, void *host, } memset(mis->postcopy_tmp_zero_page, '\0', mis->largest_page_si= ze); } - return postcopy_place_page(mis, host, mis->postcopy_tmp_zero_page, - rb); + return postcopy_place_page(mis, host, mis->postcopy_tmp_zero_page,= rb); } } =20 diff --git a/migration/ram.c b/migration/ram.c index a0d3bc60b2..c1d6eadf38 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -2384,16 +2384,6 @@ static bool save_page_use_compression(RAMState *rs) return false; } =20 - /* - * The decompression threads asynchronously write into RAM - * rather than use the atomic copies needed to avoid - * userfaulting. It should be possible to fix the decompression - * threads for compatibility in future. - */ - if (migration_in_postcopy()) { - return false; - } - /* * If xbzrle is on, stop using the data compression after first * round of migration even if compression is enabled. In theory, @@ -3433,6 +3423,11 @@ static int ram_save_iterate(QEMUFile *f, void *opaqu= e) } i++; } + + if (migrate_postcopy_ram()) { + flush_compressed_data(rs); + } + rcu_read_unlock(); =20 /* @@ -4019,6 +4014,7 @@ static int ram_load_postcopy(QEMUFile *f) void *place_source =3D NULL; RAMBlock *block =3D NULL; uint8_t ch; + int len; =20 addr =3D qemu_get_be64(f); =20 @@ -4036,7 +4032,8 @@ static int ram_load_postcopy(QEMUFile *f) =20 trace_ram_load_postcopy_loop((uint64_t)addr, flags); place_needed =3D false; - if (flags & (RAM_SAVE_FLAG_ZERO | RAM_SAVE_FLAG_PAGE)) { + if (flags & (RAM_SAVE_FLAG_ZERO | RAM_SAVE_FLAG_PAGE | + RAM_SAVE_FLAG_COMPRESS_PAGE)) { block =3D ram_block_from_stream(f, flags); =20 host =3D host_from_ram_block_offset(block, addr); @@ -4109,6 +4106,17 @@ static int ram_load_postcopy(QEMUFile *f) TARGET_PAGE_SIZE); } break; + case RAM_SAVE_FLAG_COMPRESS_PAGE: + all_zero =3D false; + len =3D qemu_get_be32(f); + if (len < 0 || len > compressBound(TARGET_PAGE_SIZE)) { + error_report("Invalid compressed data length: %d", len); + ret =3D -EINVAL; + break; + } + decompress_data_with_multi_threads(f, page_buffer, len); + ret |=3D wait_for_decompress_done(); + break; case RAM_SAVE_FLAG_EOS: /* normal exit */ multifd_recv_sync_main(); @@ -4130,8 +4138,7 @@ static int ram_load_postcopy(QEMUFile *f) void *place_dest =3D host + TARGET_PAGE_SIZE - block->page_siz= e; =20 if (all_zero) { - ret =3D postcopy_place_page_zero(mis, place_dest, - block); + ret =3D postcopy_place_page_zero(mis, place_dest, block); } else { ret =3D postcopy_place_page(mis, place_dest, place_source, block); @@ -4372,6 +4379,7 @@ static int ram_load_precopy(QEMUFile *f) } } =20 + ret |=3D wait_for_decompress_done(); return ret; } =20 @@ -4405,7 +4413,6 @@ static int ram_load(QEMUFile *f, void *opaque, int ve= rsion_id) ret =3D ram_load_precopy(f); } =20 - ret |=3D wait_for_decompress_done(); rcu_read_unlock(); trace_ram_load_complete(ret, seq_iter); =20 --=20 2.17.1