From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753595AbeFDO5U (ORCPT ); Mon, 4 Jun 2018 10:57:20 -0400 Received: from shelob.surriel.com ([96.67.55.147]:50978 "EHLO shelob.surriel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751473AbeFDO5T (ORCPT ); Mon, 4 Jun 2018 10:57:19 -0400 Message-ID: <1528124238.7898.106.camel@surriel.com> Subject: Re: [PATCH 03/19] sched/numa: Simplify load_too_imbalanced From: Rik van Riel To: Srikar Dronamraju , Ingo Molnar , Peter Zijlstra Cc: LKML , Mel Gorman , Thomas Gleixner Date: Mon, 04 Jun 2018 10:57:18 -0400 In-Reply-To: <1528106428-19992-4-git-send-email-srikar@linux.vnet.ibm.com> References: <1528106428-19992-1-git-send-email-srikar@linux.vnet.ibm.com> <1528106428-19992-4-git-send-email-srikar@linux.vnet.ibm.com> Content-Type: multipart/signed; micalg="pgp-sha256"; protocol="application/pgp-signature"; boundary="=-solBE/0ZvhJA4if6sX6C" X-Mailer: Evolution 3.26.6 (3.26.6-1.fc27) Mime-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-solBE/0ZvhJA4if6sX6C Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2018-06-04 at 15:30 +0530, Srikar Dronamraju wrote: > Currently load_too_imbalance() cares about the slope of imbalance. > It doesn't care of the direction of the imbalance. >=20 > However this may not work if nodes that are being compared have > dissimilar capacities. Few nodes might have more cores than other > nodes > in the system. Also unlike traditional load balance at a NUMA sched > domain, multiple requests to migrate from the same source node to > same > destination node may run in parallel. This can cause huge load > imbalance. This is specially true on a larger machines with either > large > cores per node or more number of nodes in the system. Hence allow > move/swap only if the imbalance is going to reduce. > Signed-off-by: Srikar Dronamraju Reviewed-by: Rik van Riel --=20 All Rights Reversed. --=-solBE/0ZvhJA4if6sX6C Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNATURE----- iQEzBAABCAAdFiEEKR73pCCtJ5Xj3yADznnekoTE3oMFAlsVU04ACgkQznnekoTE 3oNSDAgApd4DNcPeeQL7l42ZqQcPYgiCFvaSlzr8bHWc9COVNw4EAbxrogTFxlK7 MjA/1psoN7inf0PkUf9R5N16QI2mbNiAA6B5hKgUQHdnVKsrhUPLA3Fv/uM1D8hd wOWNQCTzhkp+nkgFhxu1VhrpKrSrkg1sUliOj0I5MMC5daAhzZ6K4EMsj1VCxDkw 9bM5tg28R7kfFgW/xEi18wEkfexZxg8WYYcL60PpGceI+eDzm9pmziyi19zh2o2x M6/cOslctQS+27J0CM5bMlMMmEDWQwKoGXZJ/rPduHLUKVYlI37t/xNWpe7CDdo5 CCX9+rmg+sb5wSl8EtQUnf1/IERw6Q== =LBNN -----END PGP SIGNATURE----- --=-solBE/0ZvhJA4if6sX6C--