From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from smtp4.osuosl.org (smtp4.osuosl.org [140.211.166.137]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id A269CC77B7E for ; Thu, 1 Jun 2023 07:43:49 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp4.osuosl.org (Postfix) with ESMTP id 1A43F41BA2; Thu, 1 Jun 2023 07:43:49 +0000 (UTC) DKIM-Filter: OpenDKIM Filter v2.11.0 smtp4.osuosl.org 1A43F41BA2 Authentication-Results: smtp4.osuosl.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=W33fsJRy X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp4.osuosl.org ([127.0.0.1]) by localhost (smtp4.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id krKo9fx8Il0T; Thu, 1 Jun 2023 07:43:47 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by smtp4.osuosl.org (Postfix) with ESMTPS id 439E541BB3; Thu, 1 Jun 2023 07:43:47 +0000 (UTC) DKIM-Filter: OpenDKIM Filter v2.11.0 smtp4.osuosl.org 439E541BB3 Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 10505C007A; Thu, 1 Jun 2023 07:43:47 +0000 (UTC) Received: from smtp2.osuosl.org (smtp2.osuosl.org [IPv6:2605:bc80:3010::133]) by lists.linuxfoundation.org (Postfix) with ESMTP id 84076C0029 for ; Thu, 1 Jun 2023 07:43:45 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp2.osuosl.org (Postfix) with ESMTP id 5F651405A7 for ; Thu, 1 Jun 2023 07:43:45 +0000 (UTC) DKIM-Filter: OpenDKIM Filter v2.11.0 smtp2.osuosl.org 5F651405A7 Authentication-Results: smtp2.osuosl.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=W33fsJRy X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp2.osuosl.org ([127.0.0.1]) by localhost (smtp2.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id GDwGC_DOdoHK for ; Thu, 1 Jun 2023 07:43:44 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.8.0 DKIM-Filter: OpenDKIM Filter v2.11.0 smtp2.osuosl.org 84ED0402E0 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by smtp2.osuosl.org (Postfix) with ESMTPS id 84ED0402E0 for ; Thu, 1 Jun 2023 07:43:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1685605423; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=kvJ0J/2Ad97d0Y3oIleyJnXlsfA2gT2V2y9NzKFld6k=; b=W33fsJRyfQFpaZvvCI3q98ntjxaqCffNyvLEViNombKeJ3G4iydrHk41kddWcH3YWajEAt 0tNjud6y2jYzA+zl5VM+C+t2ptvnT6jSuZQ8pngLKt92GUMmQ0SBEuOXsr76OTxwMUUE8x 56qLnOos1Gc2/4IcCb/cJrjaTtU1aJw= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-184-qCUySRT8PqyLHtBT12q-rA-1; Thu, 01 Jun 2023 03:43:40 -0400 X-MC-Unique: qCUySRT8PqyLHtBT12q-rA-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 56EA885A5BB; Thu, 1 Jun 2023 07:43:39 +0000 (UTC) Received: from dhcp-27-174.brq.redhat.com (unknown [10.45.226.135]) by smtp.corp.redhat.com (Postfix) with SMTP id 5C07B2166B25; Thu, 1 Jun 2023 07:43:36 +0000 (UTC) Received: by dhcp-27-174.brq.redhat.com (nbSMTP-1.00) for uid 1000 oleg@redhat.com; Thu, 1 Jun 2023 09:43:20 +0200 (CEST) Date: Thu, 1 Jun 2023 09:43:16 +0200 From: Oleg Nesterov To: Jason Wang Subject: Re: [PATCH 3/3] fork, vhost: Use CLONE_THREAD to fix freezer/ps regression Message-ID: <20230601074315.GA13133@redhat.com> References: <20230522025124.5863-4-michael.christie@oracle.com> <20230522123029.GA22159@redhat.com> <20230522174757.GC22159@redhat.com> <20230523121506.GA6562@redhat.com> <26c87be0-8e19-d677-a51b-e6821e6f7ae4@redhat.com> <20230531072449.GA25046@redhat.com> <20230531091432.GB25046@redhat.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.24 (2015-08-30) X-Scanned-By: MIMEDefang 3.1 on 10.11.54.6 Cc: axboe@kernel.dk, brauner@kernel.org, mst@redhat.com, linux@leemhuis.info, linux-kernel@vger.kernel.org, ebiederm@xmission.com, stefanha@redhat.com, nicolas.dichtel@6wind.com, virtualization@lists.linux-foundation.org, torvalds@linux-foundation.org X-BeenThere: virtualization@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Linux virtualization List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: virtualization-bounces@lists.linux-foundation.org Sender: "Virtualization" T24gMDYvMDEsIEphc29uIFdhbmcgd3JvdGU6Cj4KPiBPbiBXZWQsIE1heSAzMSwgMjAyMyBhdCA1 OjE04oCvUE0gT2xlZyBOZXN0ZXJvdiA8b2xlZ0ByZWRoYXQuY29tPiB3cm90ZToKPiA+Cj4gPiA+ ID4gSSBkb24ndCB1bmRlcnN0YW5kIHlvdS4gT0ssIHRvIHNpbXBsaWZ5LCBzdXBwb3NlIHdlIGhh dmUgMiBnbG9iYWwgdmFycwo+ID4gPiA+Cj4gPiA+ID4gICAgICAgICB2b2lkICpQVFIgPSBzb21l dGhpbmdfbm9uX251bGw7Cj4gPiA+ID4gICAgICAgICB1bnNpZ25lZCBsb25nIEZMQUdTID0gLTF1 bDsKPiA+ID4gPgo+ID4gPiA+IE5vdyBJIHRoaW5rIHRoaXMgY29kZQo+ID4gPiA+Cj4gPiA+ID4g ICAgICAgICBDUFVfMCAgICAgICAgICAgICAgICAgICAgICAgICAgIENQVV8xCj4gPiA+ID4KPiA+ ID4gPiAgICAgICAgIHZvaWQgKnB0ciA9IFBUUjsgICAgICAgICAgICAgICAgaWYgKCF0ZXN0X2Fu ZF9zZXRfYml0KDAsIEZMQUdTKSkKPiA+ID4gPiAgICAgICAgIGNsZWFyX2JpdCgwLCBGTEFHUyk7 ICAgICAgICAgICAgICAgICAgICBQVFIgPSBOVUxMOwo+ID4gPiA+ICAgICAgICAgQlVHX09OKCFw dHIpOwo+ID4gPiA+Cj4gPiA+ID4gaXMgcmFjeSBhbmQgY2FuIGhpdCB0aGUgQlVHX09OKCFwdHIp Lgo+ID4gPgo+ID4gPiBUaGlzIHNlZW1zIGRpZmZlcmVudCB0byB0aGUgYWJvdmUgY2FzZT8KPiA+ Cj4gPiBub3Qgc3VyZSwKPiA+Cj4gPiA+IEFuZCB5b3UgY2FuIGhpdCBCVUdfT04gd2l0aAo+ID4g PiB0aGUgZm9sbG93aW5nIGV4ZWN1dGlvbiBzZXF1ZW5jZToKPiA+ID4KPiA+ID4gW2NwdSAwXSBj bGVhcl9iaXQoMCwgRkxBR1MpOwo+ID4gPiBbY3B1IDFdIGlmICghdGVzdF9hbmRfc2V0X2JpdCgw LCBGTEFHUykpCj4gPiA+IFtjcHUgMV0gUFRSID0gTlVMTDsKPiA+ID4gW2NwdSAwXSBCVUdfT04o IXB0cikKPiA+Cj4gPiBJIGRvbid0IHVuZGVyc3RhbmQgdGhpcyBwYXJ0Li4uIHllcywgd2UgY2Fu IGhpdCB0aGlzIEJVR19PTigpIHdpdGhvdXQgbWIgaW4KPiA+IGJldHdlZW4sIHRoaXMgaXMgd2hh dCBJIHRyaWVkIHRvIHNheS4KPgo+IEkgbWF5IG1pc3Mgc29tZXRoaW5nLAoKT3IgbWUuLi4gbm90 ZSB0aGF0IENQVV8wIGxvYWRzIHRoZSBnbG9iYWwgIlBUUiIgaW50byB0aGUgbG9jYWwgInB0ciIg YmVmb3JlIGNsZWFyX2JpdC4KU2luY2UgeW91IGhhdmUgbWVudGlvbmVkIHRoZSBwcm9ncmFtIG9y ZGVyOiB5ZXMgdGhpcyBsYWNrcyBSRUFEX09OQ0UoKSBvciBiYXJyaWVyKCksCmJ1dCB0aGUgc2Ft ZSBpcyB0cnVlIGZvciB0aGUgY29kZSBpbiB2aG9zdF93b3JrZXIoKS4gU28gSSBzdGlsbCBkb24n dCB1bmRlcnN0YW5kLgoKPiBidXQgdGhlIGFib3ZlIGlzIHRoZSBzZXF1ZW5jZSB0aGF0IGlzIGV4 ZWN1dGVkCj4gYnkgdGhlIHByb2Nlc3NvciAoZm9yIGVhY2ggQ1BVLCBpdCdzIGp1c3QgdGhlIHBy b2dyYW0gb3JkZXIpLiBTbyB3aGVyZQo+IGRvIHlvdSBleHBlY3QgdG8gcGxhY2UgYW4gbWIgY2Fu IGhlbHA/CgpiZWZvcmUgY2xlYXJfYml0OgoKCUNQVV8wCgoJdm9pZCAqcHRyID0gUFRSOwoJbWIo KTsJCQkvLyBpbXBsaWVzIGNvbXBpbGVyIGJhcnJpZXIgYXMgd2VsbAoJY2xlYXJfYml0KDAsIEZM QUdTKTsKCUJVR19PTighcHRyKTsKCmp1c3QgaW4gY2FzZS4uLiBtYigpIGluIHRoZSBjb2RlIGFi b3ZlIGlzIG9ubHkgZm9yIGlsbHVzdHJhdGlvbiwgd2UgY2FuIHVzZQpzbXBfbWJfX2JlZm9yZV9h dG9taWMoKSArIGNsZWFyX2JpdCgpLiBPciBqdXN0IGNsZWFyX2JpdF91bmxvY2soKSwgaWl1YyB0 aGUKb25lLXdheSBiYXJyaWVyIGlzIGZpbmUgaW4gdGhpcyBjYXNlLgoKCj4gPiA+IEluIHZob3N0 IGNvZGUsIHRoZXJlJ3MgYSBjb25kaXRpb24gYmVmb3JlIHRoZSBjbGVhcl9iaXQoKSB3aGljaCBz aXRzCj4gPiA+IGluc2lkZSBsbGlzdF9mb3JfZWFjaF9lbnRyeV9zYWZlKCk6Cj4gPiA+Cj4gPiA+ ICNkZWZpbmUgbGxpc3RfZm9yX2VhY2hfZW50cnlfc2FmZShwb3MsIG4sIG5vZGUsIG1lbWJlcikg ICAgICAgICAgICAgICAgICAgICAgICBcCj4gPiA+ICAgICAgICAgZm9yIChwb3MgPSBsbGlzdF9l bnRyeSgobm9kZSksIHR5cGVvZigqcG9zKSwgbWVtYmVyKTsgICAgICAgICAgICAgICAgICBcCj4g PiA+ICAgICAgICAgICAgICBtZW1iZXJfYWRkcmVzc19pc19ub25udWxsKHBvcywgbWVtYmVyKSAm JiAgICAgICAgICAgICAgICAgICAgICAgICBcCj4gPiA+ICAgICAgICAgICAgICAgICAobiA9IGxs aXN0X2VudHJ5KHBvcy0+bWVtYmVyLm5leHQsIHR5cGVvZigqbiksIG1lbWJlciksIHRydWUpOyBc Cj4gPiA+ICAgICAgICAgICAgICBwb3MgPSBuKQo+ID4gPgo+ID4gPiBUaGUgY2xlYXJfYml0KCkg aXMgYSBzdG9yZSB3aGljaCBpcyBub3Qgc3BlY3VsYXRlZCwgc28gdGhlcmUncyBhCj4gPiA+IGNv bnRyb2wgZGVwZW5kZW5jeSwgdGhlIHN0b3JlIGNhbid0IGJlIGV4ZWN1dGVkIHVudGlsIHRoZSBj b25kaXRpb24KPiA+ID4gZXhwcmVzc2lvbiBpcyBldmFsdWF0ZWQgd2hpY2ggcmVxdWlyZXMgcG9z LT5tZW1iZXIubmV4dAo+ID4gPiAod29yay0+bm9kZS5uZXh0KSB0byBiZSBsb2FkZWQuCj4gPgo+ ID4gQnV0IGxsaXN0X2Zvcl9lYWNoX2VudHJ5X3NhZmUoKSBkb2Vzbid0IGNoZWNrICJuIiwgSSBt ZWFuLCBpdCBpcyBub3QgdGhhdCB3ZSBoYXZlCj4gPiBzb21ldGhpbmcgbGlrZQo+ID4KPiA+ICAg ICAgICAgbiA9IGxsaXN0X2VudHJ5KC4uLik7Cj4gPiAgICAgICAgIGlmIChuKQo+ID4gICAgICAg ICAgICAgICAgIGNsZWFyX2JpdCguLi4pOwo+ID4KPiA+IHNvIEkgZG8gbm90IHNlZSBob3cgY2Fu IHdlIHJlbHkgb24gdGhlIGxvYWQtc3RvcmUgY29udHJvbCBkZXBlbmRlbmN5Lgo+Cj4gSnVzdCB0 byBtYWtlIHN1cmUgd2UgYXJlIG9uIHRoZSBzYW1lIHBhZ2UsIHRoZSBjb25kaXRpb24gZXhwcmVz c2lvbiBpcwo+Cj4gbWVtYmVyX2FkZHJlc3NfaXNfbm9ubnVsbChwb3MsIG1lbWJlcikgJiYgKG4g PQo+IGxsaXN0X2VudHJ5KHBvcy0+bWVtYmVyLm5leHQsIHR5cGVvZigqbiksIG1lbWJlciksIHRy dWUpCj4KPiBTbyBpdCdzIHNvbWV0aGluZyBsaWtlOgo+Cj4gaWYgKHdvcmstPm5vZGUgJiYgKHdv cmtfbmV4dCA9IHdvcmstPm5vZGUtPm5leHQsIHRydWUpKQo+ICAgICBjbGVhcl9iaXQoJndvcmst PmZsYWdzKTsKPgo+IFNvIHR3byBsb2FkcyBmcm9tIGJvdGggd29yay0+bm9kZSBhbmQgd29yay0+ bm9kZS0+bmV4dCwgYW5kIHRoZXJlJ3MgYQo+IHN0b3JlIHdoaWNoIGlzIGNsZWFyX2JpdCwgdGhl biBpdCdzIGEgbG9hZC1zdG9yZSBjb250cm9sIGRlcGVuZGVuY2llcz8KCkkgZ3Vlc3MgeW91IG1p c3NlZCB0aGUgY29tbWEgZXhwcmVzc2lvbi4uLiBMZXQgbWUgcmV3cml0ZSB5b3VyIHBzZXVkby1j b2RlCmFib3ZlLCBpdCBpcyBlcXVpdmFsZW50IHRvCgoJaWYgKHdvcmstPm5vZGUpIHsKCQlpZiAo KHdvcmtfbmV4dCA9IHdvcmstPm5vZGUtPm5leHQsIHRydWUpKQoJCQljbGVhcl9iaXQoJndvcmst PmZsYWdzKTsKCX0KCmFub3RoZXIgcmV3cml0ZToKCQoJaWYgKHdvcmstPm5vZGUpIHsKCQl3b3Jr X25leHQgPSB3b3JrLT5ub2RlLT5uZXh0OwoJCWlmICgod29yaywgdHJ1ZSkpCgkJCWNsZWFyX2Jp dCgmd29yay0+ZmxhZ3MpOwoJfQoKYW5kIHRoZSBmaW5hbCByZXdyaXRlOgoKCWlmICh3b3JrLT5u b2RlKSB7CgkJd29ya19uZXh0ID0gd29yay0+bm9kZS0+bmV4dDsKCQlpZiAodHJ1ZSkKCQkJY2xl YXJfYml0KCZ3b3JrLT5mbGFncyk7Cgl9CgpzbyBhZ2FpbiwgSSBkbyBub3Qgc2VlIHRoZSBsb2Fk LXN0b3JlIGNvbnRyb2wgZGVwZW5kZW5jeS4gTm90IHRvIG1lbnRpb24gdGhpcwpjb2RlIGxhY2tz IFJFQURfT05DRSgpLgoKCklmIHdlIGhhZCBzb21ldGhpbmcgbGlrZQoKCWlmICh3b3JrLT5ub2Rl KSB7CgkJd29ya19uZXh0ID0gUkVBRF9PTkNFKHdvcmstPm5vZGUtPm5leHQpOwoJCWlmICh3b3Jr X25leHQpCgkJCWNsZWFyX2JpdCgmd29yay0+ZmxhZ3MpOwoJfQoKaW5zdGVhZCwgdGhlbiB5ZXMs IHdlIGNvdWxkIHJlbHkgb24gdGhlIExPQUQtU1RPUkUgZGVwZW5kZW5jeS4KCk9sZWcuCgpfX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpWaXJ0dWFsaXphdGlv biBtYWlsaW5nIGxpc3QKVmlydHVhbGl6YXRpb25AbGlzdHMubGludXgtZm91bmRhdGlvbi5vcmcK aHR0cHM6Ly9saXN0cy5saW51eGZvdW5kYXRpb24ub3JnL21haWxtYW4vbGlzdGluZm8vdmlydHVh bGl6YXRpb24=