From: Michael Ellerman <mpe@ellerman.id.au> To: qemu-devel@nongnu.org Cc: <kvm@vger.kernel.org>, alfs@linux.vnet.ibm.com, jfrei@linux.vnet.ibm.com, agraf@suse.de, jan.kiszka@siemens.com, pbonzini@redhat.com, aik@ozlabs.ru Subject: [PATCH 1/6] kvm_stat: Only consider online cpus Date: Tue, 17 Jun 2014 17:54:30 +1000 [thread overview] Message-ID: <1402991675-24905-1-git-send-email-mpe@ellerman.id.au> (raw) In kvm_stat we grovel through /sys to find out how many cpus are in the system. However if a cpu is offline it will still be present in /sys, and the perf_event_open() will fail. Modify the logic to only return online cpus. We need to be careful on systems which don't support cpu hotplug, the online file will not be present at all. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> --- scripts/kvm/kvm_stat | 24 ++++++++++++++++++------ 1 file changed, 18 insertions(+), 6 deletions(-) diff --git a/scripts/kvm/kvm_stat b/scripts/kvm/kvm_stat index d7e97e7..2a788bc 100755 --- a/scripts/kvm/kvm_stat +++ b/scripts/kvm/kvm_stat @@ -311,18 +311,30 @@ class TracepointProvider(object): self.select(fields) def fields(self): return self._fields + + def _online_cpus(self): + l = [] + pattern = r'cpu([0-9]+)' + basedir = '/sys/devices/system/cpu' + for entry in os.listdir(basedir): + match = re.match(pattern, entry) + if not match: + continue + path = os.path.join(basedir, entry, 'online') + if os.path.exists(path) and open(path).read().strip() != '1': + continue + l.append(int(match.group(1))) + return l + def _setup(self, _fields): self._fields = _fields - cpure = r'cpu([0-9]+)' - self.cpus = [int(re.match(cpure, x).group(1)) - for x in os.listdir('/sys/devices/system/cpu') - if re.match(cpure, x)] + cpus = self._online_cpus() import resource - nfiles = len(self.cpus) * 1000 + nfiles = len(cpus) * 1000 resource.setrlimit(resource.RLIMIT_NOFILE, (nfiles, nfiles)) events = [] self.group_leaders = [] - for cpu in self.cpus: + for cpu in cpus: group = Group(cpu) for name in _fields: tracepoint = name -- 1.9.1
WARNING: multiple messages have this Message-ID (diff)
From: Michael Ellerman <mpe@ellerman.id.au> To: qemu-devel@nongnu.org Cc: kvm@vger.kernel.org, aik@ozlabs.ru, jan.kiszka@siemens.com, agraf@suse.de, jfrei@linux.vnet.ibm.com, alfs@linux.vnet.ibm.com, pbonzini@redhat.com Subject: [Qemu-devel] [PATCH 1/6] kvm_stat: Only consider online cpus Date: Tue, 17 Jun 2014 17:54:30 +1000 [thread overview] Message-ID: <1402991675-24905-1-git-send-email-mpe@ellerman.id.au> (raw) In kvm_stat we grovel through /sys to find out how many cpus are in the system. However if a cpu is offline it will still be present in /sys, and the perf_event_open() will fail. Modify the logic to only return online cpus. We need to be careful on systems which don't support cpu hotplug, the online file will not be present at all. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> --- scripts/kvm/kvm_stat | 24 ++++++++++++++++++------ 1 file changed, 18 insertions(+), 6 deletions(-) diff --git a/scripts/kvm/kvm_stat b/scripts/kvm/kvm_stat index d7e97e7..2a788bc 100755 --- a/scripts/kvm/kvm_stat +++ b/scripts/kvm/kvm_stat @@ -311,18 +311,30 @@ class TracepointProvider(object): self.select(fields) def fields(self): return self._fields + + def _online_cpus(self): + l = [] + pattern = r'cpu([0-9]+)' + basedir = '/sys/devices/system/cpu' + for entry in os.listdir(basedir): + match = re.match(pattern, entry) + if not match: + continue + path = os.path.join(basedir, entry, 'online') + if os.path.exists(path) and open(path).read().strip() != '1': + continue + l.append(int(match.group(1))) + return l + def _setup(self, _fields): self._fields = _fields - cpure = r'cpu([0-9]+)' - self.cpus = [int(re.match(cpure, x).group(1)) - for x in os.listdir('/sys/devices/system/cpu') - if re.match(cpure, x)] + cpus = self._online_cpus() import resource - nfiles = len(self.cpus) * 1000 + nfiles = len(cpus) * 1000 resource.setrlimit(resource.RLIMIT_NOFILE, (nfiles, nfiles)) events = [] self.group_leaders = [] - for cpu in self.cpus: + for cpu in cpus: group = Group(cpu) for name in _fields: tracepoint = name -- 1.9.1
next reply other threads:[~2014-06-17 7:54 UTC|newest] Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top 2014-06-17 7:54 Michael Ellerman [this message] 2014-06-17 7:54 ` [Qemu-devel] [PATCH 1/6] kvm_stat: Only consider online cpus Michael Ellerman 2014-06-17 7:54 ` [PATCH 2/6] kvm_stat: Fix the non-x86 exit reasons Michael Ellerman 2014-06-17 7:54 ` [Qemu-devel] " Michael Ellerman 2014-10-31 15:49 ` Paolo Bonzini 2014-10-31 15:49 ` [Qemu-devel] " Paolo Bonzini 2014-06-17 7:54 ` [PATCH 3/6] kvm_stat: Rework platform detection Michael Ellerman 2014-06-17 7:54 ` [Qemu-devel] " Michael Ellerman 2014-06-17 7:54 ` [PATCH 4/6] kvm_stat: Fix tracepoint filter definition for s390 Michael Ellerman 2014-06-17 7:54 ` [Qemu-devel] " Michael Ellerman 2014-06-17 7:54 ` [PATCH 5/6] kvm_stat: Abstract ioctl numbers Michael Ellerman 2014-06-17 7:54 ` [Qemu-devel] " Michael Ellerman 2014-06-17 7:54 ` [PATCH 6/6] kvm_stat: Add powerpc support Michael Ellerman 2014-06-17 7:54 ` [Qemu-devel] " Michael Ellerman 2014-06-17 8:27 ` Alexander Graf 2014-06-17 8:27 ` [Qemu-devel] " Alexander Graf 2014-06-18 0:50 ` Michael Ellerman 2014-06-18 0:50 ` [Qemu-devel] " Michael Ellerman 2014-06-18 0:59 ` Alexander Graf 2014-06-18 0:59 ` [Qemu-devel] " Alexander Graf 2014-06-18 1:37 ` Michael Ellerman 2014-06-18 1:37 ` [Qemu-devel] " Michael Ellerman 2014-06-18 1:54 ` Alexander Graf 2014-06-18 1:54 ` [Qemu-devel] " Alexander Graf 2014-10-31 15:36 ` Paolo Bonzini 2014-10-31 15:36 ` [Qemu-devel] " Paolo Bonzini 2014-11-03 0:40 ` Michael Ellerman 2014-11-03 0:40 ` [Qemu-devel] " Michael Ellerman
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=1402991675-24905-1-git-send-email-mpe@ellerman.id.au \ --to=mpe@ellerman.id.au \ --cc=agraf@suse.de \ --cc=aik@ozlabs.ru \ --cc=alfs@linux.vnet.ibm.com \ --cc=jan.kiszka@siemens.com \ --cc=jfrei@linux.vnet.ibm.com \ --cc=kvm@vger.kernel.org \ --cc=pbonzini@redhat.com \ --cc=qemu-devel@nongnu.org \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes, see mirroring instructions on how to clone and mirror all data and code used by this external index.