From patchwork Wed Dec 9 02:42:21 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Xu X-Patchwork-Id: 554207 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id DD88E14030F for ; Wed, 9 Dec 2015 13:47:33 +1100 (AEDT) Received: from localhost ([::1]:34323 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1a6Umx-00048s-NP for incoming@patchwork.ozlabs.org; Tue, 08 Dec 2015 21:47:31 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:58936) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1a6Uje-0006rT-6N for qemu-devel@nongnu.org; Tue, 08 Dec 2015 21:44:07 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1a6Uja-0005QQ-V0 for qemu-devel@nongnu.org; Tue, 08 Dec 2015 21:44:06 -0500 Received: from mx1.redhat.com ([209.132.183.28]:33121) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1a6Uja-0005Q8-Oe for qemu-devel@nongnu.org; Tue, 08 Dec 2015 21:44:02 -0500 Received: from int-mx10.intmail.prod.int.phx2.redhat.com (int-mx10.intmail.prod.int.phx2.redhat.com [10.5.11.23]) by mx1.redhat.com (Postfix) with ESMTPS id 64AC924B for ; Wed, 9 Dec 2015 02:44:02 +0000 (UTC) Received: from pxdev.xzpeter.org.com (vpn1-5-205.pek2.redhat.com [10.72.5.205]) by int-mx10.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id tB92gTJU026279; Tue, 8 Dec 2015 21:43:55 -0500 From: Peter Xu To: qemu-devel@nongnu.org Date: Wed, 9 Dec 2015 10:42:21 +0800 Message-Id: <1449628943-10197-10-git-send-email-peterx@redhat.com> In-Reply-To: <1449628943-10197-1-git-send-email-peterx@redhat.com> References: <1449628943-10197-1-git-send-email-peterx@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.23 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 209.132.183.28 Cc: drjones@redhat.com, lersek@redhat.com, armbru@redhat.com, peterx@redhat.com, lcapitulino@redhat.com, famz@redhat.com, pbonzini@redhat.com Subject: [Qemu-devel] [PATCH v6 09/11] Dump: add qmp command "query-dump" X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org When dump-guest-memory is requested with detach flag, after its return, user could query its status using "query-dump" command (with no argument). The result contains: - status: current dump status - completed: bytes written in the latest dump - total: bytes to write in the latest dump From completed and total, we could know how much work finished by calculating: 100.0 * completed / total (%) Signed-off-by: Peter Xu --- dump.c | 22 ++++++++++++++++++---- qapi-schema.json | 32 +++++++++++++++++++++++++++++++- qmp-commands.hx | 27 ++++++++++++++++++++++++++- 3 files changed, 75 insertions(+), 6 deletions(-) diff --git a/dump.c b/dump.c index 334b256..80afa1e 100644 --- a/dump.c +++ b/dump.c @@ -1432,7 +1432,7 @@ static void dump_state_prepare(DumpState *s) bool dump_in_progress(void) { DumpState *state = &dump_state_global; - return (state->status == DUMP_STATUS_ACTIVE); + return (atomic_read(&state->status) == DUMP_STATUS_ACTIVE); } /* calculate total size of memory to be dumped (taking filter into @@ -1640,8 +1640,10 @@ static void dump_process(DumpState *s, Error **errp) create_vmcore(s, &local_err); } - s->status = (local_err ? DUMP_STATUS_FAILED : DUMP_STATUS_COMPLETED); - error_propagate(errp, local_err); + /* make sure status is written after written_size updates */ + smp_wmb(); + atomic_set(&s->status, + (local_err ? DUMP_STATUS_FAILED : DUMP_STATUS_COMPLETED)); dump_cleanup(s); } @@ -1660,6 +1662,18 @@ static void *dump_thread(void *data) return NULL; } +DumpQueryResult *qmp_query_dump(Error **errp) +{ + DumpQueryResult *result = g_new(DumpQueryResult, 1); + DumpState *state = &dump_state_global; + result->status = atomic_read(&state->status); + /* make sure we are reading status and written_size in order */ + smp_rmb(); + result->completed = state->written_size; + result->total = state->total_size; + return result; +} + void qmp_dump_guest_memory(bool paging, const char *file, bool has_detach, bool detach, bool has_begin, int64_t begin, bool has_length, @@ -1750,7 +1764,7 @@ void qmp_dump_guest_memory(bool paging, const char *file, begin, length, &local_err); if (local_err) { error_propagate(errp, local_err); - s->status = DUMP_STATUS_FAILED; + atomic_set(&s->status, DUMP_STATUS_FAILED); return; } diff --git a/qapi-schema.json b/qapi-schema.json index 691a130..11447a5 100644 --- a/qapi-schema.json +++ b/qapi-schema.json @@ -2116,7 +2116,8 @@ # is the fd's name. # # @detach: #optional if true, QMP will return immediately rather than -# waiting for the dump to finish. (since 2.6). +# waiting for the dump to finish. The user can track progress +# using "query-dump". (since 2.6). # # @begin: #optional if specified, the starting physical address. # @@ -2157,6 +2158,35 @@ 'data': [ 'none', 'active', 'completed', 'failed' ] } ## +# @DumpQueryResult +# +# The result format for 'query-dump'. +# +# @status: enum of @DumpStatus, which shows current dump status +# +# @completed: bytes written in latest dump (uncompressed) +# +# @total: total bytes to be written in latest dump (uncompressed) +# +# Since 2.6 +## +{ 'struct': 'DumpQueryResult', + 'data': { 'status': 'DumpStatus', + 'completed': 'int', + 'total': 'int' } } + +## +# @query-dump +# +# Query latest dump status. +# +# Returns: A @DumpStatus object showing the dump status. +# +# Since: 2.6 +## +{ 'command': 'query-dump', 'returns': 'DumpQueryResult' } + +## # @DumpGuestMemoryCapability: # # A list of the available formats for dump-guest-memory diff --git a/qmp-commands.hx b/qmp-commands.hx index 6b51585..a740ea5 100644 --- a/qmp-commands.hx +++ b/qmp-commands.hx @@ -858,7 +858,8 @@ Arguments: - "protocol": destination file(started with "file:") or destination file descriptor (started with "fd:") (json-string) - "detach": if specified, command will return immediately, without waiting - for the dump to finish (json-bool) + for the dump to finish. The user can track progress using + "query-dump". (json-bool) - "begin": the starting physical address. It's optional, and should be specified with length together (json-int) - "length": the memory size, in bytes. It's optional, and should be specified @@ -898,6 +899,30 @@ Example: EQMP + { + .name = "query-dump", + .args_type = "", + .params = "", + .help = "query background dump status", + .mhandler.cmd_new = qmp_marshal_query_dump, + }, + +SQMP +query-dump +---------- + +Query background dump status. + +Arguments: None. + +Example: + +-> { "execute": "query-dump" } +<- { "return": { "status": "active", "completed": 1024000, + "total": 2048000 } } + +EQMP + #if defined TARGET_S390X { .name = "dump-skeys",