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[70.27.3.10]) by smtp.gmail.com with ESMTPSA id y9-20020a056638228900b00344c3de5ec7sm4404709jas.150.2022.08.29.09.57.19 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Mon, 29 Aug 2022 09:57:20 -0700 (PDT) From: Peter Xu To: qemu-devel@nongnu.org Cc: "Daniel P . Berrange" , Leonardo Bras Soares Passos , Manish Mishra , Juan Quintela , "Dr . David Alan Gilbert" , peterx@redhat.com Subject: [PATCH RFC 12/13] migration: Move last_sent_block into PageSearchStatus Date: Mon, 29 Aug 2022 12:56:58 -0400 Message-Id: <20220829165659.96046-13-peterx@redhat.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220829165659.96046-1-peterx@redhat.com> References: <20220829165659.96046-1-peterx@redhat.com> MIME-Version: 1.0 Content-type: text/plain Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=170.10.133.124; envelope-from=peterx@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, 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+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Since we use PageSearchStatus to represent a channel, it makes perfect sense to keep last_sent_block (aka, leverage RAM_SAVE_FLAG_CONTINUE) to be per-channel rather than global because each channel can be sending different pages on ramblocks. Hence move it from RAMState into PageSearchStatus. Signed-off-by: Peter Xu --- migration/ram.c | 71 ++++++++++++++++++++++++++++--------------------- 1 file changed, 41 insertions(+), 30 deletions(-) diff --git a/migration/ram.c b/migration/ram.c index 2be9b91ffc..ef89812c69 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -89,6 +89,8 @@ XBZRLECacheStats xbzrle_counters; struct PageSearchStatus { /* The migration channel used for a specific host page */ QEMUFile *pss_channel; + /* Last block from where we have sent data */ + RAMBlock *last_sent_block; /* Current block being searched */ RAMBlock *block; /* Current page to search from */ @@ -368,8 +370,6 @@ struct RAMState { int uffdio_fd; /* Last block that we have visited searching for dirty pages */ RAMBlock *last_seen_block; - /* Last block from where we have sent data */ - RAMBlock *last_sent_block; /* Last dirty target page we have sent */ ram_addr_t last_page; /* last ram version we have seen */ @@ -677,16 +677,17 @@ exit: * * Returns the number of bytes written * - * @f: QEMUFile where to send the data + * @pss: current PSS channel status * @block: block that contains the page we want to send * @offset: offset inside the block for the page * in the lower bits, it contains flags */ -static size_t save_page_header(RAMState *rs, QEMUFile *f, RAMBlock *block, +static size_t save_page_header(PageSearchStatus *pss, RAMBlock *block, ram_addr_t offset) { size_t size, len; - bool same_block = (block == rs->last_sent_block); + bool same_block = (block == pss->last_sent_block); + QEMUFile *f = pss->pss_channel; if (same_block) { offset |= RAM_SAVE_FLAG_CONTINUE; @@ -699,7 +700,7 @@ static size_t save_page_header(RAMState *rs, QEMUFile *f, RAMBlock *block, qemu_put_byte(f, len); qemu_put_buffer(f, (uint8_t *)block->idstr, len); size += 1 + len; - rs->last_sent_block = block; + pss->last_sent_block = block; } return size; } @@ -783,17 +784,19 @@ static void xbzrle_cache_zero_page(RAMState *rs, ram_addr_t current_addr) * -1 means that xbzrle would be longer than normal * * @rs: current RAM state + * @pss: current PSS channel * @current_data: pointer to the address of the page contents * @current_addr: addr of the page * @block: block that contains the page we want to send * @offset: offset inside the block for the page */ -static int save_xbzrle_page(RAMState *rs, QEMUFile *file, +static int save_xbzrle_page(RAMState *rs, PageSearchStatus *pss, uint8_t **current_data, ram_addr_t current_addr, RAMBlock *block, ram_addr_t offset) { int encoded_len = 0, bytes_xbzrle; uint8_t *prev_cached_page; + QEMUFile *file = pss->pss_channel; if (!cache_is_cached(XBZRLE.cache, current_addr, ram_counters.dirty_sync_count)) { @@ -858,7 +861,7 @@ static int save_xbzrle_page(RAMState *rs, QEMUFile *file, } /* Send XBZRLE based compressed page */ - bytes_xbzrle = save_page_header(rs, file, block, + bytes_xbzrle = save_page_header(pss, block, offset | RAM_SAVE_FLAG_XBZRLE); qemu_put_byte(file, ENCODING_FLAG_XBZRLE); qemu_put_be16(file, encoded_len); @@ -1286,19 +1289,19 @@ static void ram_release_page(const char *rbname, uint64_t offset) * Returns the size of data written to the file, 0 means the page is not * a zero page * - * @rs: current RAM state - * @file: the file where the data is saved + * @pss: current PSS channel * @block: block that contains the page we want to send * @offset: offset inside the block for the page */ -static int save_zero_page_to_file(RAMState *rs, QEMUFile *file, +static int save_zero_page_to_file(PageSearchStatus *pss, RAMBlock *block, ram_addr_t offset) { uint8_t *p = block->host + offset; + QEMUFile *file = pss->pss_channel; int len = 0; if (buffer_is_zero(p, TARGET_PAGE_SIZE)) { - len += save_page_header(rs, file, block, offset | RAM_SAVE_FLAG_ZERO); + len += save_page_header(pss, block, offset | RAM_SAVE_FLAG_ZERO); qemu_put_byte(file, 0); len += 1; ram_release_page(block->idstr, offset); @@ -1311,14 +1314,14 @@ static int save_zero_page_to_file(RAMState *rs, QEMUFile *file, * * Returns the number of pages written. * - * @rs: current RAM state + * @pss: current PSS channel * @block: block that contains the page we want to send * @offset: offset inside the block for the page */ -static int save_zero_page(RAMState *rs, QEMUFile *file, RAMBlock *block, +static int save_zero_page(PageSearchStatus *pss, RAMBlock *block, ram_addr_t offset) { - int len = save_zero_page_to_file(rs, file, block, offset); + int len = save_zero_page_to_file(pss, block, offset); if (len) { ram_counters.duplicate++; @@ -1371,16 +1374,18 @@ static bool control_save_page(PageSearchStatus *pss, RAMBlock *block, * * Returns the number of pages written. * - * @rs: current RAM state + * @pss: current PSS channel * @block: block that contains the page we want to send * @offset: offset inside the block for the page * @buf: the page to be sent * @async: send to page asyncly */ -static int save_normal_page(RAMState *rs, QEMUFile *file, RAMBlock *block, +static int save_normal_page(PageSearchStatus *pss, RAMBlock *block, ram_addr_t offset, uint8_t *buf, bool async) { - ram_transferred_add(save_page_header(rs, file, block, + QEMUFile *file = pss->pss_channel; + + ram_transferred_add(save_page_header(pss, block, offset | RAM_SAVE_FLAG_PAGE)); if (async) { qemu_put_buffer_async(file, buf, TARGET_PAGE_SIZE, @@ -1420,7 +1425,7 @@ static int ram_save_page(RAMState *rs, PageSearchStatus *pss) XBZRLE_cache_lock(); if (rs->xbzrle_enabled && !migration_in_postcopy()) { - pages = save_xbzrle_page(rs, pss->pss_channel, &p, current_addr, + pages = save_xbzrle_page(rs, pss, &p, current_addr, block, offset); if (!rs->last_stage) { /* Can't send this cached data async, since the cache page @@ -1432,8 +1437,7 @@ static int ram_save_page(RAMState *rs, PageSearchStatus *pss) /* XBZRLE overflow or normal page */ if (pages == -1) { - pages = save_normal_page(rs, pss->pss_channel, block, offset, - p, send_async); + pages = save_normal_page(pss, block, offset, p, send_async); } XBZRLE_cache_unlock(); @@ -1456,14 +1460,15 @@ static bool do_compress_ram_page(QEMUFile *f, z_stream *stream, RAMBlock *block, ram_addr_t offset, uint8_t *source_buf) { RAMState *rs = ram_state; + PageSearchStatus *pss = &rs->pss[RAM_CHANNEL_PRECOPY]; uint8_t *p = block->host + offset; int ret; - if (save_zero_page_to_file(rs, f, block, offset)) { + if (save_zero_page_to_file(pss, block, offset)) { return true; } - save_page_header(rs, f, block, offset | RAM_SAVE_FLAG_COMPRESS_PAGE); + save_page_header(pss, block, offset | RAM_SAVE_FLAG_COMPRESS_PAGE); /* * copy it to a internal buffer to avoid it being modified by VM @@ -2283,7 +2288,8 @@ static bool save_page_use_compression(RAMState *rs) * has been properly handled by compression, otherwise needs other * paths to handle it */ -static bool save_compress_page(RAMState *rs, RAMBlock *block, ram_addr_t offset) +static bool save_compress_page(RAMState *rs, PageSearchStatus *pss, + RAMBlock *block, ram_addr_t offset) { if (!save_page_use_compression(rs)) { return false; @@ -2299,7 +2305,7 @@ static bool save_compress_page(RAMState *rs, RAMBlock *block, ram_addr_t offset) * We post the fist page as normal page as compression will take * much CPU resource. */ - if (block != rs->last_sent_block) { + if (block != pss->last_sent_block) { flush_compressed_data(rs); return false; } @@ -2330,11 +2336,11 @@ static int ram_save_target_page(RAMState *rs, PageSearchStatus *pss) return res; } - if (save_compress_page(rs, block, offset)) { + if (save_compress_page(rs, pss, block, offset)) { return 1; } - res = save_zero_page(rs, pss->pss_channel, block, offset); + res = save_zero_page(pss, block, offset); if (res > 0) { /* Must let xbzrle know, otherwise a previous (now 0'd) cached * page would be stale @@ -2466,7 +2472,7 @@ static void postcopy_preempt_choose_channel(RAMState *rs, PageSearchStatus *pss) * If channel switched, reset last_sent_block since the old sent block * may not be on the same channel. */ - rs->last_sent_block = NULL; + pss->last_sent_block = NULL; trace_postcopy_preempt_switch_channel(channel); } @@ -2793,8 +2799,13 @@ static void ram_save_cleanup(void *opaque) static void ram_state_reset(RAMState *rs) { + int i; + + for (i = 0; i < RAM_CHANNEL_MAX; i++) { + rs->pss[i].last_sent_block = NULL; + } + rs->last_seen_block = NULL; - rs->last_sent_block = NULL; rs->last_page = 0; rs->last_version = ram_list.version; rs->xbzrle_enabled = false; @@ -2988,8 +2999,8 @@ void ram_postcopy_send_discard_bitmap(MigrationState *ms) migration_bitmap_sync(rs); /* Easiest way to make sure we don't resume in the middle of a host-page */ + rs->pss[RAM_CHANNEL_PRECOPY].last_sent_block = NULL; rs->last_seen_block = NULL; - rs->last_sent_block = NULL; rs->last_page = 0; postcopy_each_ram_send_discard(ms); -- 2.32.0