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bh=yXARo6F2GozGH5ZiS7RDUGuSpDE3GjQfYaFMomR8jIU=; b=Z44A6xnpzn+58tasEElnDesYWddP6kS+1Oke7g2CCQoqg6gO8DThj8V7/NcyJtnLLs5rIC V9PkrzbzDWKucpjqeMe7r8k7AvwWDQ7IdAkv0MPa8XsOZs8hyTKbtsveg/L/ksRCJeMtzW r/bn4ermCxxWcKXkEU51nrAjcjEE4Q8= X-MC-Unique: dpzVXr1CPT2wreuv43eGAg-1 From: Juan Quintela To: qemu-devel@nongnu.org Cc: Thomas Huth , Juan Quintela , Paolo Bonzini , Peter Xu , Laurent Vivier , Leonardo Bras , Lukas Straub Subject: [PATCH 06/13] ram.c: Do not call save_page_header() from compress threads Date: Mon, 8 May 2023 17:26:50 +0200 Message-Id: <20230508152657.66701-7-quintela@redhat.com> In-Reply-To: <20230508152657.66701-1-quintela@redhat.com> References: <20230508152657.66701-1-quintela@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.1 on 10.11.54.2 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=quintela@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1683559732138100026 Content-Type: text/plain; charset="utf-8" From: Lukas Straub save_page_header() accesses several global variables, so calling it from multiple threads is pretty ugly. Instead, call save_page_header() before writing out the compressed data from the compress buffer to the migration stream. This also makes the core compress code more independend from ram.c. Signed-off-by: Lukas Straub Reviewed-by: Juan Quintela Signed-off-by: Juan Quintela --- migration/ram.c | 44 +++++++++++++++++++++++++++++++++++--------- 1 file changed, 35 insertions(+), 9 deletions(-) diff --git a/migration/ram.c b/migration/ram.c index 4e14e3bb94..c52602b70d 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -1465,17 +1465,13 @@ static CompressResult do_compress_ram_page(QEMUFile= *f, z_stream *stream, RAMBlock *block, ram_addr_t off= set, uint8_t *source_buf) { - RAMState *rs =3D ram_state; - PageSearchStatus *pss =3D &rs->pss[RAM_CHANNEL_PRECOPY]; uint8_t *p =3D block->host + offset; int ret; =20 - if (save_zero_page_to_file(pss, f, block, offset)) { + if (buffer_is_zero(p, TARGET_PAGE_SIZE)) { return RES_ZEROPAGE; } =20 - save_page_header(pss, f, block, offset | RAM_SAVE_FLAG_COMPRESS_PAGE); - /* * copy it to a internal buffer to avoid it being modified by VM * so that we can catch up the error during compression and @@ -1515,9 +1511,40 @@ static inline void compress_reset_result(CompressPar= am *param) param->offset =3D 0; } =20 +static int send_queued_data(CompressParam *param) +{ + PageSearchStatus *pss =3D &ram_state->pss[RAM_CHANNEL_PRECOPY]; + MigrationState *ms =3D migrate_get_current(); + QEMUFile *file =3D ms->to_dst_file; + int len =3D 0; + + RAMBlock *block =3D param->block; + ram_addr_t offset =3D param->offset; + + if (param->result =3D=3D RES_NONE) { + return 0; + } + + assert(block =3D=3D pss->last_sent_block); + + if (param->result =3D=3D RES_ZEROPAGE) { + len +=3D save_page_header(pss, file, block, offset | RAM_SAVE_FLAG= _ZERO); + qemu_put_byte(file, 0); + len +=3D 1; + ram_release_page(block->idstr, offset); + } else if (param->result =3D=3D RES_COMPRESS) { + len +=3D save_page_header(pss, file, block, + offset | RAM_SAVE_FLAG_COMPRESS_PAGE); + len +=3D qemu_put_qemu_file(file, param->file); + } else { + abort(); + } + + return len; +} + static void flush_compressed_data(RAMState *rs) { - MigrationState *ms =3D migrate_get_current(); int idx, len, thread_count; =20 if (!save_page_use_compression(rs)) { @@ -1537,7 +1564,7 @@ static void flush_compressed_data(RAMState *rs) qemu_mutex_lock(&comp_param[idx].mutex); if (!comp_param[idx].quit) { CompressParam *param =3D &comp_param[idx]; - len =3D qemu_put_qemu_file(ms->to_dst_file, param->file); + len =3D send_queued_data(param); compress_reset_result(param); =20 /* @@ -1563,7 +1590,6 @@ static int compress_page_with_multi_thread(RAMBlock *= block, ram_addr_t offset) { int idx, thread_count, bytes_xmit =3D -1, pages =3D -1; bool wait =3D migrate_compress_wait_thread(); - MigrationState *ms =3D migrate_get_current(); =20 thread_count =3D migrate_compress_threads(); qemu_mutex_lock(&comp_done_lock); @@ -1573,7 +1599,7 @@ retry: CompressParam *param =3D &comp_param[idx]; qemu_mutex_lock(¶m->mutex); param->done =3D false; - bytes_xmit =3D qemu_put_qemu_file(ms->to_dst_file, param->file= ); + bytes_xmit =3D send_queued_data(param); compress_reset_result(param); set_compress_params(param, block, offset); =20 --=20 2.40.0