From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:40705) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dQIEJ-000555-0S for qemu-devel@nongnu.org; Wed, 28 Jun 2017 15:02:24 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dQIEG-0008NC-IZ for qemu-devel@nongnu.org; Wed, 28 Jun 2017 15:02:23 -0400 Received: from mx1.redhat.com ([209.132.183.28]:46314) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1dQIEG-0008N2-9V for qemu-devel@nongnu.org; Wed, 28 Jun 2017 15:02:20 -0400 From: "Dr. David Alan Gilbert (git)" Date: Wed, 28 Jun 2017 20:00:35 +0100 Message-Id: <20170628190047.26159-18-dgilbert@redhat.com> In-Reply-To: <20170628190047.26159-1-dgilbert@redhat.com> References: <20170628190047.26159-1-dgilbert@redhat.com> Subject: [Qemu-devel] [RFC 17/29] vhost+postcopy: Send requests to source for shared pages List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org, a.perevalov@samsung.com, marcandre.lureau@redhat.com, maxime.coquelin@redhat.com, mst@redhat.com, quintela@redhat.com, peterx@redhat.com, lvivier@redhat.com, aarcange@redhat.com From: "Dr. David Alan Gilbert" Send requests back to the source for shared page requests. Signed-off-by: Dr. David Alan Gilbert --- migration/migration.h | 2 ++ migration/postcopy-ram.c | 31 ++++++++++++++++++++++++++++--- migration/postcopy-ram.h | 3 +++ migration/trace-events | 2 ++ 4 files changed, 35 insertions(+), 3 deletions(-) diff --git a/migration/migration.h b/migration/migration.h index 1210b217a1..5fa0bb7b53 100644 --- a/migration/migration.h +++ b/migration/migration.h @@ -49,6 +49,8 @@ struct MigrationIncomingState { int userfault_quit_fd; QEMUFile *to_src_file; QemuMutex rp_mutex; /* We send replies from multiple threads */ + /* RAMBlock of last request sent to source */ + RAMBlock *last_rb; void *postcopy_tmp_page; void *postcopy_tmp_zero_page; /* PostCopyFD's for external userfaultfds & handlers of shared memory */ diff --git a/migration/postcopy-ram.c b/migration/postcopy-ram.c index d43a73c108..cbf10236f0 100644 --- a/migration/postcopy-ram.c +++ b/migration/postcopy-ram.c @@ -460,6 +460,31 @@ static int ram_block_enable_notify(const char *block_name, void *host_addr, } /* + * Callback from shared fault handlers to ask for a page, + * the page must be specified by a RAMBlock and an offset in that rb + */ +int postcopy_request_shared_page(struct PostCopyFD *pcfd, RAMBlock *rb, + uint64_t client_addr, uint64_t rb_offset) +{ + size_t pagesize = qemu_ram_pagesize(rb); + uint64_t aligned_rbo = rb_offset & ~(pagesize - 1); + MigrationIncomingState *mis = migration_incoming_get_current(); + + trace_postcopy_request_shared_page(pcfd->idstr, qemu_ram_get_idstr(rb), + rb_offset); + /* TODO: Check bitmap to see if we already have the page */ + if (rb != mis->last_rb) { + mis->last_rb = rb; + migrate_send_rp_req_pages(mis, qemu_ram_get_idstr(rb), + aligned_rbo, pagesize); + } else { + /* Save some space */ + migrate_send_rp_req_pages(mis, NULL, aligned_rbo, pagesize); + } + return 0; +} + +/* * Handle faults detected by the USERFAULT markings */ static void *postcopy_ram_fault_thread(void *opaque) @@ -469,9 +494,9 @@ static void *postcopy_ram_fault_thread(void *opaque) int ret; size_t index; RAMBlock *rb = NULL; - RAMBlock *last_rb = NULL; /* last RAMBlock we sent part of */ trace_postcopy_ram_fault_thread_entry(); + mis->last_rb = NULL; /* last RAMBlock we sent part of */ qemu_sem_post(&mis->fault_thread_sem); struct pollfd *pfd; @@ -560,8 +585,8 @@ static void *postcopy_ram_fault_thread(void *opaque) * Send the request to the source - we want to request one * of our host page sizes (which is >= TPS) */ - if (rb != last_rb) { - last_rb = rb; + if (rb != mis->last_rb) { + mis->last_rb = rb; migrate_send_rp_req_pages(mis, qemu_ram_get_idstr(rb), rb_offset, qemu_ram_pagesize(rb)); } else { diff --git a/migration/postcopy-ram.h b/migration/postcopy-ram.h index 873c147b68..69e88b0174 100644 --- a/migration/postcopy-ram.h +++ b/migration/postcopy-ram.h @@ -162,5 +162,8 @@ struct PostCopyFD { */ void postcopy_register_shared_ufd(struct PostCopyFD *pcfd); void postcopy_unregister_shared_ufd(struct PostCopyFD *pcfd); +/* Callback from shared fault handlers to ask for a page */ +int postcopy_request_shared_page(struct PostCopyFD *pcfd, RAMBlock *rb, + uint64_t client_addr, uint64_t offset); #endif diff --git a/migration/trace-events b/migration/trace-events index 522cfa170d..7ac8f9cf41 100644 --- a/migration/trace-events +++ b/migration/trace-events @@ -197,6 +197,8 @@ postcopy_ram_incoming_cleanup_closeuf(void) "" postcopy_ram_incoming_cleanup_entry(void) "" postcopy_ram_incoming_cleanup_exit(void) "" postcopy_ram_incoming_cleanup_join(void) "" +postcopy_request_shared_page(const char *sharer, const char *rb, uint64_t rb_offset) "for %s in %s offset %"PRIx64 + save_xbzrle_page_skipping(void) "" save_xbzrle_page_overflow(void) "" ram_save_iterate_big_wait(uint64_t milliconds, int iterations) "big wait: %" PRIu64 " milliseconds, %d iterations" -- 2.13.0