From patchwork Fri Feb 16 13:16:13 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Dr. David Alan Gilbert" X-Patchwork-Id: 10224703 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 703DE601E7 for ; Fri, 16 Feb 2018 13:28:13 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5F86528EF5 for ; Fri, 16 Feb 2018 13:28:13 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 5459F28FFD; Fri, 16 Feb 2018 13:28:13 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_HK_NAME_DR autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id D7A5828EF5 for ; Fri, 16 Feb 2018 13:28:12 +0000 (UTC) Received: from localhost ([::1]:48244 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1emg3f-0002eG-Ku for patchwork-qemu-devel@patchwork.kernel.org; Fri, 16 Feb 2018 08:28:11 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:51880) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1emfsl-0001Vf-Ht for qemu-devel@nongnu.org; Fri, 16 Feb 2018 08:16:58 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1emfsk-0005xB-EW for qemu-devel@nongnu.org; Fri, 16 Feb 2018 08:16:55 -0500 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:46380 helo=mx1.redhat.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1emfsk-0005wh-8J for qemu-devel@nongnu.org; Fri, 16 Feb 2018 08:16:54 -0500 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id E3F967D85D for ; Fri, 16 Feb 2018 13:16:53 +0000 (UTC) Received: from dgilbert-t530.redhat.com (unknown [10.36.118.23]) by smtp.corp.redhat.com (Postfix) with ESMTP id 9BC54213AEE2; Fri, 16 Feb 2018 13:16:52 +0000 (UTC) From: "Dr. David Alan Gilbert (git)" To: qemu-devel@nongnu.org, maxime.coquelin@redhat.com, marcandre.lureau@redhat.com, peterx@redhat.com, imammedo@redhat.com, mst@redhat.com Date: Fri, 16 Feb 2018 13:16:13 +0000 Message-Id: <20180216131625.9639-18-dgilbert@redhat.com> In-Reply-To: <20180216131625.9639-1-dgilbert@redhat.com> References: <20180216131625.9639-1-dgilbert@redhat.com> X-Scanned-By: MIMEDefang 2.78 on 10.11.54.6 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.2]); Fri, 16 Feb 2018 13:16:53 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.2]); Fri, 16 Feb 2018 13:16:53 +0000 (UTC) for IP:'10.11.54.6' DOMAIN:'int-mx06.intmail.prod.int.rdu2.redhat.com' HELO:'smtp.corp.redhat.com' FROM:'dgilbert@redhat.com' RCPT:'' X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 66.187.233.73 Subject: [Qemu-devel] [PATCH v3 17/29] vhost+postcopy: Send requests to source for shared pages X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: aarcange@redhat.com, quintela@redhat.com Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP 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 d158e62cf2..457bf37ec2 100644 --- a/migration/migration.h +++ b/migration/migration.h @@ -46,6 +46,8 @@ 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 d118b78bf5..277ff749a0 100644 --- a/migration/postcopy-ram.c +++ b/migration/postcopy-ram.c @@ -534,6 +534,31 @@ static int ram_block_enable_notify(const char *block_name, void *host_addr, return 0; } +/* + * 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 */ @@ -544,9 +569,9 @@ 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; @@ -634,8 +659,8 @@ 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 dbc2ee1f2b..4c63f20df4 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 1e617ad7a6..7c910b5479 100644 --- a/migration/trace-events +++ b/migration/trace-events @@ -198,6 +198,8 @@ 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 0x%"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"