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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E6477C433EF for ; Mon, 4 Oct 2021 05:32:23 +0000 (UTC) Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 85F3261205 for ; Mon, 4 Oct 2021 05:32:23 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 85F3261205 Authentication-Results: mail.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=suse.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=lists.xenproject.org Received: from list by lists.xenproject.org with outflank-mailman.201166.355583 (Exim 4.92) (envelope-from ) id 1mXGZm-0000TV-7I; Mon, 04 Oct 2021 05:31:46 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 201166.355583; Mon, 04 Oct 2021 05:31:46 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1mXGZm-0000TO-4D; Mon, 04 Oct 2021 05:31:46 +0000 Received: by outflank-mailman (input) for mailman id 201166; Mon, 04 Oct 2021 05:31:44 +0000 Received: from all-amaz-eas1.inumbo.com ([34.197.232.57] helo=us1-amaz-eas2.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1mXGZj-0000TI-Vd for xen-devel@lists.xenproject.org; Mon, 04 Oct 2021 05:31:44 +0000 Received: from smtp-out2.suse.de (unknown [195.135.220.29]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTPS id 5ad447de-24d4-11ec-be99-12813bfff9fa; Mon, 04 Oct 2021 05:31:42 +0000 (UTC) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id 6F7221FFBE; Mon, 4 Oct 2021 05:31:41 +0000 (UTC) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id 5523F133A6; Mon, 4 Oct 2021 05:31:41 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id 9i6KE72RWmEWTgAAMHmgww (envelope-from ); Mon, 04 Oct 2021 05:31:41 +0000 X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 5ad447de-24d4-11ec-be99-12813bfff9fa DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1633325501; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=iPYUIllycLo2HuYYYxhIELFRTEakrWpSdfB6Up0ETSo=; b=SWad/84HQ5ljVDQK9/ibzcgN7HRJ3+Vu5n47syOeFMzJdXpNw16G99QirMCG3pzxQk94a1 P/B6pMxft+YNoL0qDdNVia8cj7OWXzk5Eg5WmFJXEPuTyi/3iu3ZfVdgRzBwh/AGZ+XDmT e4rbANiPBZbEAgEyedsc5VW5KTl7lHE= Subject: Re: xen-balloon thread using 100% of CPU, regression in 5.4.150 To: =?UTF-8?Q?Marek_Marczykowski-G=c3=b3recki?= , xen-devel Cc: Jan Beulich References: From: Juergen Gross Message-ID: <37c22c61-80be-fc48-18e6-2b1ee22cc765@suse.com> Date: Mon, 4 Oct 2021 07:31:40 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.12.0 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="mtOEZHnRc6942ExwsnPtn5QoGrfi6Z7sr" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --mtOEZHnRc6942ExwsnPtn5QoGrfi6Z7sr Content-Type: multipart/mixed; boundary="kU7Kewd1kBfd9MEHYRfjjRc4wJoH9HC07"; protected-headers="v1" From: Juergen Gross To: =?UTF-8?Q?Marek_Marczykowski-G=c3=b3recki?= , xen-devel Cc: Jan Beulich Message-ID: <37c22c61-80be-fc48-18e6-2b1ee22cc765@suse.com> Subject: Re: xen-balloon thread using 100% of CPU, regression in 5.4.150 References: In-Reply-To: --kU7Kewd1kBfd9MEHYRfjjRc4wJoH9HC07 Content-Type: multipart/mixed; boundary="------------2AAC713BCC362BE157EB8760" Content-Language: en-US This is a multi-part message in MIME format. --------------2AAC713BCC362BE157EB8760 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: quoted-printable On 03.10.21 06:47, Marek Marczykowski-G=C3=B3recki wrote: > Hi, >=20 > After updating a PVH domU to 5.4.150, I see xen-balloon thread using > 100% CPU (one thread). > This is a domain started with memory=3Dmaxmem=3D716800KiB (via libvirt)= =2E Then, > inside, I see: >=20 > # cat /sys/devices/system/xen_memory/xen_memory0/target_kb > 716924 > # cat /sys/devices/system/xen_memory/xen_memory0/info/current_kb > 716400 >=20 > Doing `cat info/current_kb > target_kb` "fixes" the issue. But still, > something is wrong - on earlier kernel (5.4.143 to be precise), it > wasn't spinning, with exactly the same values reported in sysfs. It > shouldn't run in circles if it can't get that much memory it wants. I > strongly suspect "xen/balloon: use a kernel thread instead a workqueue"= > or related commit being responsible, but I haven't verified it. I think you are right. I need to handle the BP_ECANCELED case similar to BP_EAGAIN in the kernel thread (wait until target size changes again). One further question: do you see any kernel message in the guest related to the looping balloon thread? Juergen --------------2AAC713BCC362BE157EB8760 Content-Type: application/pgp-keys; name="OpenPGP_0xB0DE9DD628BF132F.asc" Content-Transfer-Encoding: quoted-printable Content-Description: OpenPGP public key Content-Disposition: attachment; filename="OpenPGP_0xB0DE9DD628BF132F.asc" -----BEGIN PGP PUBLIC KEY BLOCK----- xsBNBFOMcBYBCACgGjqjoGvbEouQZw/ToiBg9W98AlM2QHV+iNHsEs7kxWhKMjrioyspZKOBy= cWx w3ie3j9uvg9EOB3aN4xiTv4qbnGiTr3oJhkB1gsb6ToJQZ8uxGq2kaV2KL9650I1SJvedYm8O= f8Z d621lSmoKOwlNClALZNew72NjJLEzTalU1OdT7/i1TXkH09XSSI8mEQ/ouNcMvIJNwQpd369y= 9bf IhWUiVXEK7MlRgUG6MvIj6Y3Am/BBLUVbDa4+gmzDC9ezlZkTZG2t14zWPvxXP3FAp2pkW0xq= G7/ 377qptDmrk42GlSKN4z76ELnLxussxc7I2hx18NUcbP8+uty4bMxABEBAAHNHEp1ZXJnZW4gR= 3Jv c3MgPGpnQHBmdXBmLm5ldD7CwHkEEwECACMFAlOMcBYCGwMHCwkIBwMCAQYVCAIJCgsEFgIDA= QIe AQIXgAAKCRCw3p3WKL8TL0KdB/93FcIZ3GCNwFU0u3EjNbNjmXBKDY4FUGNQH2lvWAUy+dnyT= hpw dtF/jQ6j9RwE8VP0+NXcYpGJDWlNb9/JmYqLiX2Q3TyevpB0CA3dbBQp0OW0fgCetToGIQrg0= MbD 1C/sEOv8Mr4NAfbauXjZlvTj30H2jO0u+6WGM6nHwbh2l5O8ZiHkH32iaSTfN7Eu5RnNVUJbv= oPH Z8SlM4KWm8rG+lIkGurqqu5gu8q8ZMKdsdGC4bBxdQKDKHEFExLJK/nRPFmAuGlId1E3fe10v= 5QL +qHI3EIPtyfE7i9Hz6rVwi7lWKgh7pe0ZvatAudZ+JNIlBKptb64FaiIOAWDCx1SzR9KdWVyZ= 2Vu IEdyb3NzIDxqZ3Jvc3NAc3VzZS5jb20+wsB5BBMBAgAjBQJTjHCvAhsDBwsJCAcDAgEGFQgCC= QoL BBYCAwECHgECF4AACgkQsN6d1ii/Ey/HmQf/RtI7kv5A2PS4RF7HoZhPVPogNVbC4YA6lW7Dr= Wf0 teC0RR3MzXfy6pJ+7KLgkqMlrAbN/8Dvjoz78X+5vhH/rDLa9BuZQlhFmvcGtCF8eR0T1v0nC= /nu AFVGy+67q2DH8As3KPu0344TBDpAvr2uYM4tSqxK4DURx5INz4ZZ0WNFHcqsfvlGJALDeE0Lh= ITT d9jLzdDad1pQSToCnLl6SBJZjDOX9QQcyUigZFtCXFst4dlsvddrxyqT1f17+2cFSdu7+ynLm= XBK 7abQ3rwJY8SbRO2iRulogc5vr/RLMMlscDAiDkaFQWLoqHHOdfO9rURssHNN8WkMnQfvUewRz= 80h SnVlcmdlbiBHcm9zcyA8amdyb3NzQG5vdmVsbC5jb20+wsB5BBMBAgAjBQJTjHDXAhsDBwsJC= AcD AgEGFQgCCQoLBBYCAwECHgECF4AACgkQsN6d1ii/Ey8PUQf/ehmgCI9jB9hlgexLvgOtf7PJn= FOX gMLdBQgBlVPO3/D9R8LtF9DBAFPNhlrsfIG/SqICoRCqUcJ96Pn3P7UUinFG/I0ECGF4EvTE1= jnD kfJZr6jrbjgyoZHiw/4BNwSTL9rWASyLgqlA8u1mf+c2yUwcGhgkRAd1gOwungxcwzwqgljf0= N51 N5JfVRHRtyfwq/ge+YEkDGcTU6Y0sPOuj4Dyfm8fJzdfHNQsWq3PnczLVELStJNdapwPOoE+l= otu fe3AM2vAEYJ9rTz3Cki4JFUsgLkHFqGZarrPGi1eyQcXeluldO3m91NK/1xMI3/+8jbO0tsn1= tqS EUGIJi7ox80eSnVlcmdlbiBHcm9zcyA8amdyb3NzQHN1c2UuZGU+wsB5BBMBAgAjBQJTjHDrA= hsD BwsJCAcDAgEGFQgCCQoLBBYCAwECHgECF4AACgkQsN6d1ii/Ey+LhQf9GL45eU5vOowA2u5N3= g3O ZUEBmDHVVbqMtzwlmNC4k9Kx39r5s2vcFl4tXqW7g9/ViXYuiDXb0RfUpZiIUW89siKrkzmQ5= dM7 wRqzgJpJwK8Bn2MIxAKArekWpiCKvBOB/Cc+3EXE78XdlxLyOi/NrmSGRIov0karw2RzMNOu5= D+j LRZQd1Sv27AR+IP3I8U4aqnhLpwhK7MEy9oCILlgZ1QZe49kpcumcZKORmzBTNh30FVKK1Evm= V2x AKDoaEOgQB4iFQLhJCdP1I5aSgM5IVFdn7v5YgEYuJYx37IoN1EblHI//x/e2AaIHpzK5h88N= Eaw QsaNRpNSrcfbFmAg987ATQRTjHAWAQgAyzH6AOODMBjgfWE9VeCgsrwH3exNAU32gLq2xvjpW= nHI s98ndPUDpnoxWQugJ6MpMncr0xSwFmHEgnSEjK/PAjppgmyc57BwKII3sV4on+gDVFJR6Y8ZR= wgn BC5mVM6JjQ5xDk8WRXljExRfUX9pNhdE5eBOZJrDRoLUmmjDtKzWaDhIg/+1Hzz93X4fCQkNV= bVF LELU9bMaLPBG/x5q4iYZ2k2ex6d47YE1ZFdMm6YBYMOljGkZKwYde5ldM9mo45mmwe0icXKLk= pEd IXKTZeKDO+Hdv1aqFuAcccTg9RXDQjmwhC3yEmrmcfl0+rPghO0Iv3OOImwTEe4co3c1mwARA= QAB wsBfBBgBAgAJBQJTjHAWAhsMAAoJELDendYovxMvQ/gH/1ha96vm4P/L+bQpJwrZ/dneZcmEw= Tbe 8YFsw2V/Buv6Z4Mysln3nQK5ZadD534CF7TDVft7fC4tU4PONxF5D+/tvgkPfDAfF77zy2AH1= vJz Q1fOU8lYFpZXTXIHb+559UqvIB8AdgR3SAJGHHt4RKA0F7f5ipYBBrC6cyXJyyoprT10EMvU8= VGi wXvTyJz3fjoYsdFzpWPlJEBRMedCot60g5dmbdrZ5DWClAr0yau47zpWj3enf1tLWaqcsuylW= svi uGjKGw7KHQd3bxALOknAp4dN3QwBYCKuZ7AddY9yjynVaD5X7nF9nO5BjR/i1DG86lem3iBDX= zXs ZDn8R38=3D =3D2wuH -----END PGP PUBLIC KEY BLOCK----- --------------2AAC713BCC362BE157EB8760-- --kU7Kewd1kBfd9MEHYRfjjRc4wJoH9HC07-- --mtOEZHnRc6942ExwsnPtn5QoGrfi6Z7sr Content-Type: application/pgp-signature; name="OpenPGP_signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="OpenPGP_signature" -----BEGIN PGP SIGNATURE----- wsB5BAABCAAjFiEEhRJncuj2BJSl0Jf3sN6d1ii/Ey8FAmFakbwFAwAAAAAACgkQsN6d1ii/Ey+e rAgAlIL/+2IQYU0lMZSEniNCp3F69HVu1rhqmX4CKBaalDngzNsYwr8UGNEpLiciz/hfl2le/phV mS6NXf2ZNPxAk7f6xgy7A+pCAHcenL5tSc7LGVRy2Dk0z2kCJq52y/xug4prPhzNkcs1rNkb3Qvf ogwnelnfITC4axnGXUpzdxMv5ecwa2Dm37mmqwKUi/Ngh/8pUG6bmUo7MrGUmazbA+0f2ZG8shQi /35QWWKTho9wYmR6A3Xe+S8gH3Z6vfkLWE+8hQ7xKzGzUiRT2jLO6kwAwVyNqQRokKtldK8Ndfwd CGpOFZO1pum5eJwsLU/yqGie4xmknx4Fi8p2L6xt7A== =myLl -----END PGP SIGNATURE----- --mtOEZHnRc6942ExwsnPtn5QoGrfi6Z7sr--