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Tsirkin" , Keith Busch , David Hildenbrand , qemu-trivial@nongnu.org, Hanna Reitz , Peter Xu Subject: [PATCH v2 36/51] migration: Remove RAMState.f references in compression code Date: Mon, 5 Dec 2022 10:52:13 +0100 Message-Id: <20221205095228.1314-37-quintela@redhat.com> In-Reply-To: <20221205095228.1314-1-quintela@redhat.com> References: <20221205095228.1314-1-quintela@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.1 on 10.11.54.6 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 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-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: Peter Xu Removing referencing to RAMState.f in compress_page_with_multi_thread() and flush_compressed_data(). Compression code by default isn't compatible with having >1 channels (or it won't currently know which channel to flush the compressed data), so to make it simple we always flush on the default to_dst_file port until someone wants to add >1 ports support, as rs->f right now can really change (after postcopy preempt is introduced). There should be no functional change at all after patch applied, since as long as rs->f referenced in compression code, it must be to_dst_file. Reviewed-by: Dr. David Alan Gilbert Signed-off-by: Peter Xu Signed-off-by: Juan Quintela --- migration/ram.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/migration/ram.c b/migration/ram.c index 41475431fc..6e3dc845c5 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -1461,6 +1461,7 @@ static bool save_page_use_compression(RAMState *rs); static void flush_compressed_data(RAMState *rs) { + MigrationState *ms = migrate_get_current(); int idx, len, thread_count; if (!save_page_use_compression(rs)) { @@ -1479,7 +1480,7 @@ static void flush_compressed_data(RAMState *rs) for (idx = 0; idx < thread_count; idx++) { qemu_mutex_lock(&comp_param[idx].mutex); if (!comp_param[idx].quit) { - len = qemu_put_qemu_file(rs->f, comp_param[idx].file); + len = qemu_put_qemu_file(ms->to_dst_file, comp_param[idx].file); /* * it's safe to fetch zero_page without holding comp_done_lock * as there is no further request submitted to the thread, @@ -1498,11 +1499,11 @@ static inline void set_compress_params(CompressParam *param, RAMBlock *block, param->offset = offset; } -static int compress_page_with_multi_thread(RAMState *rs, RAMBlock *block, - ram_addr_t offset) +static int compress_page_with_multi_thread(RAMBlock *block, ram_addr_t offset) { int idx, thread_count, bytes_xmit = -1, pages = -1; bool wait = migrate_compress_wait_thread(); + MigrationState *ms = migrate_get_current(); thread_count = migrate_compress_threads(); qemu_mutex_lock(&comp_done_lock); @@ -1510,7 +1511,8 @@ retry: for (idx = 0; idx < thread_count; idx++) { if (comp_param[idx].done) { comp_param[idx].done = false; - bytes_xmit = qemu_put_qemu_file(rs->f, comp_param[idx].file); + bytes_xmit = qemu_put_qemu_file(ms->to_dst_file, + comp_param[idx].file); qemu_mutex_lock(&comp_param[idx].mutex); set_compress_params(&comp_param[idx], block, offset); qemu_cond_signal(&comp_param[idx].cond); @@ -2263,7 +2265,7 @@ static bool save_compress_page(RAMState *rs, RAMBlock *block, ram_addr_t offset) return false; } - if (compress_page_with_multi_thread(rs, block, offset) > 0) { + if (compress_page_with_multi_thread(block, offset) > 0) { return true; } -- 2.38.1