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x-sender="postmaster@mail.citrix.com"; x-conformance=sidf_compatible IronPort-SDR: KPcc98wCAz7VmNkfybLHtCKZadOKWATAuQcK8CQIuHZOeFd02qSJp87ki60Q1JlmZjaF4DXIbe EXCB2QgPNCP8sqMP2oj6gVH32W3ETDunncqS1ZuFF5k2BaqeaGjJkWPw+as9wdCBdBej5D/B4Q e8LvkTLd3LZ7UkEl9BA03Umsu35ZA9VnRLSDXPbeFJxjjxitttlsbnj9rssj0fiF8nk//3fRg2 tx/jz6IS5qaB5+6B+HuubCsZ05XxEyThe6RkR5Y0mtZYXO2ZP7zJoOqTSeat+2PzqFZRD3dsvs CQM= X-SBRS: 2.7 X-MesageID: 16611592 X-Ironport-Server: esa4.hc3370-68.iphmx.com X-Remote-IP: 162.221.158.21 X-Policy: $RELAYED X-IronPort-AV: E=Sophos;i="5.72,406,1580792400"; d="scan'208";a="16611592" From: Sergey Dyasli To: Subject: [PATCH v2] sched: print information about scheduling granularity Date: Mon, 20 Apr 2020 14:06:50 +0100 Message-ID: <20200420130650.14341-1-sergey.dyasli@citrix.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Juergen Gross , Sergey Dyasli , George Dunlap , Jan Beulich , Dario Faggioli Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Currently it might be not obvious which scheduling mode (e.g. core- scheduling) is being used by the scheduler. Alleviate this by printing additional information about the selected granularity per-cpupool. Note: per-cpupool granularity selection is not implemented yet. The single global value is being used for each cpupool. Signed-off-by: Sergey Dyasli --- v2: - print information on a separate line - use per-cpupool granularity - updated commit message CC: Juergen Gross CC: Dario Faggioli CC: George Dunlap CC: Jan Beulich --- xen/common/sched/cpupool.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/xen/common/sched/cpupool.c b/xen/common/sched/cpupool.c index d40345b585..68106f6c15 100644 --- a/xen/common/sched/cpupool.c +++ b/xen/common/sched/cpupool.c @@ -40,6 +40,30 @@ static DEFINE_SPINLOCK(cpupool_lock); static enum sched_gran __read_mostly opt_sched_granularity =3D SCHED_GRAN_= cpu; static unsigned int __read_mostly sched_granularity =3D 1; =20 +static void sched_gran_print(enum sched_gran mode, unsigned int gran) +{ + char *str =3D ""; + + switch ( mode ) + { + case SCHED_GRAN_cpu: + str =3D "cpu"; + break; + case SCHED_GRAN_core: + str =3D "core"; + break; + case SCHED_GRAN_socket: + str =3D "socket"; + break; + default: + ASSERT_UNREACHABLE(); + break; + } + + printk("Scheduling granularity: %s, %u CPU%s per sched-resource\n", + str, gran, gran =3D=3D 1 ? "" : "s"); +} + #ifdef CONFIG_HAS_SCHED_GRANULARITY static int __init sched_select_granularity(const char *str) { @@ -115,6 +139,7 @@ static void __init cpupool_gran_init(void) warning_add(fallback); =20 sched_granularity =3D gran; + sched_gran_print(opt_sched_granularity, sched_granularity); } =20 unsigned int cpupool_get_granularity(const struct cpupool *c) @@ -911,6 +936,7 @@ void dump_runq(unsigned char key) { printk("Cpupool %d:\n", (*c)->cpupool_id); printk("Cpus: %*pbl\n", CPUMASK_PR((*c)->cpu_valid)); + sched_gran_print((*c)->gran, cpupool_get_granularity(*c)); schedule_dump(*c); } =20 --=20 2.17.1