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Lunev" , Eric Blake , Stefan Hajnoczi , Paolo Bonzini Subject: Re: [PATCH v2 02/12] qapi/block: Add IoAccountingOperation enum In-Reply-To: (Hanna Czenczek's message of "Thu, 22 Oct 2026 17:48:12 +0200") References: <20261019182028.45305-1-hreitz@redhat.com> <20261019182028.45305-3-hreitz@redhat.com> <87y0bssyie.fsf@pond.sub.org> Date: Fri, 23 Oct 2026 08:04:28 +0200 Message-ID: <87v76tgdg3.fsf@pond.sub.org> User-Agent: Gnus/5.13 (Gnus v5.13) X-Archived-By: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.93 Received-SPF: pass client-ip=170.10.133.124; envelope-from=armbru@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.339, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_PASS=-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: qemu development List-Archive: List-Post: List-Help: List-Subscribe: , Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org X-Spam-Status: No, score=-17.6 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_PASS, SPF_PASS,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 Hanna Czenczek writes: > On 20.10.26 07:59, Markus Armbruster wrote: >> Hanna Czenczek writes: >> >>> This enum gives more information than IoOperationType (which is used for >>> the rerror/werror distinction) to identify operation types for block >>> accounting. >>> >>> Signed-off-by: Hanna Czenczek >>> --- >>> qapi/block.json | 20 ++++++++++++++++++++ >>> 1 file changed, 20 insertions(+) >>> >>> diff --git a/qapi/block.json b/qapi/block.json >>> index 0a88d405a26..8f4a71733c1 100644 >>> --- a/qapi/block.json >>> +++ b/qapi/block.json >>> @@ -629,3 +629,23 @@ >>> 'command': 'str' }, >>> 'features': [ 'unstable' ], >>> 'allow-preconfig': true } >>> + >>> +## >>> +# @IoAccountingOperation: >>> +# >>> +# I/O operation types as they are tracked by block accounting. >> >> Can we have a link to suitable docs on block accounting? > > Which do you have in mind? Hey, I asked first! Two ideas to find candidates: 1. How is IoAccountingOperation going to be used? I can see events BLOCK_IO_DELAY and BLOCK_IO_DONE. Documentation there calls it "disk operation" in the event description and "I/O operation" in the argument description. Not a peep about "accounting". Might "tracked by block accounting" be about implementation? Or asked differently: why would the user care about block accounting here? 2. Assuming "block accounting" is actually relevant for the user: what are the QMP interfaces related to it? > Also, I=E2=80=99m not sure whether these are suitable, because they are t= he operation types used by block accounting, but for now, accounting cookie= s (block/accounting.c) use their own non-QAPI enum (enum BlockAcctType). [...]