From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751201AbeFDUIS (ORCPT ); Mon, 4 Jun 2018 16:08:18 -0400 Received: from shelob.surriel.com ([96.67.55.147]:53954 "EHLO shelob.surriel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750779AbeFDUIR (ORCPT ); Mon, 4 Jun 2018 16:08:17 -0400 Message-ID: <1528142892.7898.124.camel@surriel.com> Subject: Re: [PATCH 18/19] sched/numa: Reset scan rate whenever task moves across nodes From: Rik van Riel To: Srikar Dronamraju , Ingo Molnar , Peter Zijlstra Cc: LKML , Mel Gorman , Thomas Gleixner Date: Mon, 04 Jun 2018 16:08:12 -0400 In-Reply-To: <1528106428-19992-19-git-send-email-srikar@linux.vnet.ibm.com> References: <1528106428-19992-1-git-send-email-srikar@linux.vnet.ibm.com> <1528106428-19992-19-git-send-email-srikar@linux.vnet.ibm.com> Content-Type: multipart/signed; micalg="pgp-sha256"; protocol="application/pgp-signature"; boundary="=-N5LzdW7ax8pySuo7Sqxj" 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 --=-N5LzdW7ax8pySuo7Sqxj 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 task scan rate is reset when numa balancer migrates the > task > to a different node. If numa balancer initiates a swap, reset is only > applicable to the task that initiates the swap. Similarly no scan > rate > reset is done if the task is migrated across nodes by traditional > load > balancer. >=20 > Instead move the scan reset to the migrate_task_rq. This ensures the > task moved out of its preferred node, either gets back to its > preferred > node quickly or finds a new preferred node. Doing so, would be fair > to > all tasks migrating across nodes. How does this impact performance of benchmarks closer to real world workloads? Not just the test cases measuring NUMA convergence. --=20 All Rights Reversed. --=-N5LzdW7ax8pySuo7Sqxj Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNATURE----- iQEzBAABCAAdFiEEKR73pCCtJ5Xj3yADznnekoTE3oMFAlsVnCwACgkQznnekoTE 3oPRhggAn8cEETy6e+AhFcWGL2Jlnzp68NkKgD9U1BLT+lj5ZPSvWUoenfg0pbuK vLeNoxtjb+4TtT0O+LO+P64xuBksrbmtU+Dr5dTskDcvEF6DBSfZQICZw8b7tAdq GyHBZwnRkloKlfl8YIox1qCX5c6A2hEgmJM03pI+S0OIz8x4vN4iFlkSlBGfek33 Y5byKSeod3O4WyeZ0kymbbDB73yKmU2rerShWppbufVH+LkX2jS8zNUiekqJk+BJ 7PU6GsqOAUS07l3pt/VB0o4UjKv50ZuevFfOGadHc/lxTpSTm7XFiA07Ejg9lqfB CsCAAct3rW1o4YIQXy2PdfqOseIA8A== =4+Gb -----END PGP SIGNATURE----- --=-N5LzdW7ax8pySuo7Sqxj--