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Thu, 24 Sep 2020 12:23:40 +0000 (UTC) Received: from [10.10.115.120] (ovpn-115-120.rdu2.redhat.com [10.10.115.120]) by smtp.corp.redhat.com (Postfix) with ESMTPS id B4B04100238E; Thu, 24 Sep 2020 12:23:32 +0000 (UTC) Subject: Re: [PATCH v2 1/4] sched/isolation: API to get housekeeping online CPUs To: Frederic Weisbecker , peterz@infradead.org Cc: linux-kernel@vger.kernel.org, netdev@vger.kernel.org, linux-pci@vger.kernel.org, intel-wired-lan@lists.osuosl.org, mtosatti@redhat.com, sassmann@redhat.com, jesse.brandeburg@intel.com, lihong.yang@intel.com, helgaas@kernel.org, jeffrey.t.kirsher@intel.com, jacob.e.keller@intel.com, jlelli@redhat.com, hch@infradead.org, bhelgaas@google.com, mike.marciniszyn@intel.com, dennis.dalessandro@intel.com, thomas.lendacky@amd.com, jerinj@marvell.com, mathias.nyman@intel.com, jiri@nvidia.com, mingo@redhat.com, juri.lelli@redhat.com, vincent.guittot@linaro.org References: <20200923181126.223766-1-nitesh@redhat.com> <20200923181126.223766-2-nitesh@redhat.com> <20200924084029.GC1362448@hirez.programming.kicks-ass.net> <20200924120956.GA19346@lenoir> From: Nitesh Narayan Lal Autocrypt: addr=nitesh@redhat.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.11.0 MIME-Version: 1.0 In-Reply-To: <20200924120956.GA19346@lenoir> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=nitesh@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="ENs0iGnX0dCzHsa0SwTlnZ5oY3o7qAb22" Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --ENs0iGnX0dCzHsa0SwTlnZ5oY3o7qAb22 Content-Type: multipart/mixed; boundary="1t5XNSwI6aMElhzhwWyxggO34oCsp0dMg" --1t5XNSwI6aMElhzhwWyxggO34oCsp0dMg Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Content-Language: en-US On 9/24/20 8:09 AM, Frederic Weisbecker wrote: > On Thu, Sep 24, 2020 at 10:40:29AM +0200, peterz@infradead.org wrote: >> On Wed, Sep 23, 2020 at 02:11:23PM -0400, Nitesh Narayan Lal wrote: >>> Introduce a new API hk_num_online_cpus(), that can be used to >>> retrieve the number of online housekeeping CPUs that are meant to handl= e >>> managed IRQ jobs. >>> >>> This API is introduced for the drivers that were previously relying onl= y >>> on num_online_cpus() to determine the number of MSIX vectors to create. >>> In an RT environment with large isolated but fewer housekeeping CPUs th= is >>> was leading to a situation where an attempt to move all of the vectors >>> corresponding to isolated CPUs to housekeeping CPUs were failing due to >>> per CPU vector limit. >>> >>> Signed-off-by: Nitesh Narayan Lal >>> --- >>> include/linux/sched/isolation.h | 13 +++++++++++++ >>> 1 file changed, 13 insertions(+) >>> >>> diff --git a/include/linux/sched/isolation.h b/include/linux/sched/isol= ation.h >>> index cc9f393e2a70..2e96b626e02e 100644 >>> --- a/include/linux/sched/isolation.h >>> +++ b/include/linux/sched/isolation.h >>> @@ -57,4 +57,17 @@ static inline bool housekeeping_cpu(int cpu, enum hk= _flags flags) >>> =09return true; >>> } >>> =20 >>> +static inline unsigned int hk_num_online_cpus(void) >> This breaks with the established naming of that header. > I guess we can make it housekeeping_num_online_cpus() ? Right, I can do that. Thanks > --=20 Nitesh --1t5XNSwI6aMElhzhwWyxggO34oCsp0dMg-- --ENs0iGnX0dCzHsa0SwTlnZ5oY3o7qAb22 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEEkXcoRVGaqvbHPuAGo4ZA3AYyozkFAl9sj8IACgkQo4ZA3AYy ozn3Sg//Z6GkJhR5niXcOFKQBBbBS6hihHYSQlJGHN/mt+i5jwOz+7whwDaWJVop JyR5RvY1ZilO7e1scNAEe2tOBa5PCKu+LH2fDyAw/pZUhJpVv63GZ+zlGq2yzbcO UFlYXAJRz+Ap+fOwPMUiKwd2cvn32uDEZUY9xTberG7oJFCAoa040vDbbq6lA5sE beGBtteKx2JrarrL7oEiiabMRIfM5T92xturicqlkLkmABiuzmykSkt6Ocks0RY0 UvT1a/bJuFXPb8fYHsPNVsaGnKxRKVNQtNUKseBR+4WCgzF2DaMQMTevZ4lIw3Bk LP89h5Dbazgp8zwXJCYac25NUt13Yv7SFr5dW2ydDq/3C/GBfJKSWKh47KLLTVfu 5AmyZsdLnfOEVDDc4X2J4zEwmUjRViyAlYUkbmtnuGDm40H2KDR1eTq65+bCV6H9 Pzn/CNDMf2BwiYfqG42HTrMo5wB6N9n9y4RIelN89tujjJBUq+pB80MhaLL18j// aSZbIDUnHwdwRtb1FszYMk85I+EVAhJDwGZx9Q0c+pAe5mbmWo2TR9+U+d//AKoX pxu99YHnB1opVNn6q1GkOskHybllSXcuPICt+aQzjp/wiz5RMPzEjly9T7r7pVq2 LUQ+4PawUV4F/NxNAS3KJZlrtCnNd7L9MfkNTWIW6kFD1GJ3QTk= =U0G3 -----END PGP SIGNATURE----- --ENs0iGnX0dCzHsa0SwTlnZ5oY3o7qAb22--