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Tue, 22 Sep 2020 12:40:38 +0000 (UTC) Received: by horse.redhat.com (Postfix, from userid 10451) id 62E4F223B13; Tue, 22 Sep 2020 08:40:38 -0400 (EDT) Date: Tue, 22 Sep 2020 08:40:38 -0400 From: Vivek Goyal To: Miklos Szeredi Subject: Re: [PATCH] virtiofsd: Used glib "shared" thread pool Message-ID: <20200922124038.GA57620@redhat.com> References: <20200921213216.GE13362@redhat.com> MIME-Version: 1.0 In-Reply-To: X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=vgoyal@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Received-SPF: pass client-ip=207.211.31.81; envelope-from=vgoyal@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/22 04:19:36 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -35 X-Spam_score: -3.6 X-Spam_bar: --- X-Spam_report: (-3.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1.455, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: virtio-fs-list , qemu-devel@nongnu.org, Stefan Hajnoczi , "Dr. David Alan Gilbert" Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Tue, Sep 22, 2020 at 02:03:18PM +0200, Miklos Szeredi wrote: > On Mon, Sep 21, 2020 at 11:32 PM Vivek Goyal wrote: > > > glib offers thread pools and it seems to support "exclusive" and "shared" > > thread pools. > > > > > > https://developer.gnome.org/glib/stable/glib-Thread-Pools.html#g-thread-pool-new > > > > Currently we use "exlusive" thread pools but its performance seems to be > > poor. I tried using "shared" thread pools and performance seems much > > better. I posted performance results here. > > > > https://www.redhat.com/archives/virtio-fs/2020-September/msg00080.html > > > > So lets switch to shared thread pools. We can think of making it optional > > once somebody can show in what cases exclusive thread pools offer better > > results. For now, my simple performance tests across the board see > > better results with shared thread pools. > > > > Needs this as well: Thanks Miklos. I am wondering why I did not face this issue. May be I don't have seccomp enabled. Will check. David, can you please pick this patch as well. May be merge both the patches. Do let me know if you want to me post a merged patch instead. Thanks Vivek > > --- qemu.orig/tools/virtiofsd/passthrough_seccomp.c 2020-09-16 > 20:21:13.168686176 +0200 > +++ qemu/tools/virtiofsd/passthrough_seccomp.c 2020-09-22 > 14:01:38.499164501 +0200 > @@ -94,6 +94,8 @@ static const int syscall_whitelist[] = { > SCMP_SYS(rt_sigaction), > SCMP_SYS(rt_sigprocmask), > SCMP_SYS(rt_sigreturn), > + SCMP_SYS(sched_getattr), > + SCMP_SYS(sched_setattr), > SCMP_SYS(sendmsg), > SCMP_SYS(setresgid), > SCMP_SYS(setresuid), > > Thanks, > Miklos