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[85.223.141.74]) by smtp.gmail.com with ESMTPSA id w27sm4585275ljd.55.2019.09.11.03.32.33 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Wed, 11 Sep 2019 03:32:34 -0700 (PDT) From: Andrii Anisov To: xen-devel@lists.xenproject.org Date: Wed, 11 Sep 2019 13:32:19 +0300 Message-Id: <1568197942-15374-7-git-send-email-andrii.anisov@gmail.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1568197942-15374-1-git-send-email-andrii.anisov@gmail.com> References: <1568197942-15374-1-git-send-email-andrii.anisov@gmail.com> Subject: [Xen-devel] [RFC 6/9] sched:rtds: get guest time from time accounting code 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: George Dunlap , Andrii Anisov , Meng Xu , Dario Faggioli MIME-Version: 1.0 Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" From: Andrii Anisov While the RTDS scheduler code does not use guest time from the other pcpu, we are free to go with lockless time accounting. Signed-off-by: Andrii Anisov --- xen/common/sched_rt.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/xen/common/sched_rt.c b/xen/common/sched_rt.c index e0e350b..2ce200b 100644 --- a/xen/common/sched_rt.c +++ b/xen/common/sched_rt.c @@ -945,8 +945,9 @@ burn_budget(const struct scheduler *ops, struct rt_vcpu *svc, s_time_t now) if ( is_idle_vcpu(svc->vcpu) ) return; + ASSERT(svc->vcpu == current); /* burn at nanoseconds level */ - delta = now - svc->last_start; + delta = tacc_get_guest_time_delta(); /* * delta < 0 only happens in nested virtualization; * TODO: how should we handle delta < 0 in a better way? @@ -960,7 +961,6 @@ burn_budget(const struct scheduler *ops, struct rt_vcpu *svc, s_time_t now) } svc->cur_budget -= delta; - svc->last_start = now; if ( svc->cur_budget <= 0 ) {