From: Nitesh Narayan Lal <nitesh@redhat.com>
To: Frederic Weisbecker <frederic@kernel.org>, 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
Subject: Re: [PATCH v2 1/4] sched/isolation: API to get housekeeping online CPUs
Date: Thu, 24 Sep 2020 08:23:29 -0400 [thread overview]
Message-ID: <61d6870d-0749-6c89-38d2-49a2b1fbd569@redhat.com> (raw)
In-Reply-To: <20200924120956.GA19346@lenoir>
[-- Attachment #1.1: Type: text/plain, Size: 1528 bytes --]
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 handle
>>> managed IRQ jobs.
>>>
>>> This API is introduced for the drivers that were previously relying only
>>> on num_online_cpus() to determine the number of MSIX vectors to create.
>>> In an RT environment with large isolated but fewer housekeeping CPUs this
>>> 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 <nitesh@redhat.com>
>>> ---
>>> include/linux/sched/isolation.h | 13 +++++++++++++
>>> 1 file changed, 13 insertions(+)
>>>
>>> diff --git a/include/linux/sched/isolation.h b/include/linux/sched/isolation.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)
>>> return true;
>>> }
>>>
>>> +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
>
--
Nitesh
[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 833 bytes --]
next prev parent reply other threads:[~2020-09-24 12:23 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-23 18:11 [PATCH v2 0/4] isolation: limit msix vectors based on housekeeping CPUs Nitesh Narayan Lal
2020-09-23 18:11 ` [PATCH v2 1/4] sched/isolation: API to get housekeeping online CPUs Nitesh Narayan Lal
2020-09-24 8:40 ` peterz
2020-09-24 12:09 ` Frederic Weisbecker
2020-09-24 12:23 ` Nitesh Narayan Lal [this message]
2020-09-24 12:24 ` Peter Zijlstra
2020-09-24 12:11 ` Frederic Weisbecker
2020-09-24 12:26 ` Nitesh Narayan Lal
2020-09-24 12:46 ` Peter Zijlstra
2020-09-24 13:45 ` Nitesh Narayan Lal
2020-09-24 20:47 ` Bjorn Helgaas
2020-09-24 21:52 ` Nitesh Narayan Lal
2020-09-23 18:11 ` [PATCH v2 2/4] sched/isolation: Extend nohz_full to isolate managed IRQs Nitesh Narayan Lal
2020-09-23 18:11 ` [PATCH v2 3/4] i40e: limit msix vectors based on housekeeping CPUs Nitesh Narayan Lal
2020-09-23 18:11 ` [PATCH v2 4/4] PCI: Limit pci_alloc_irq_vectors as per " Nitesh Narayan Lal
2020-09-24 20:45 ` Bjorn Helgaas
2020-09-24 21:39 ` Nitesh Narayan Lal
2020-09-24 22:59 ` Bjorn Helgaas
2020-09-24 23:40 ` Nitesh Narayan Lal
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=61d6870d-0749-6c89-38d2-49a2b1fbd569@redhat.com \
--to=nitesh@redhat.com \
--cc=bhelgaas@google.com \
--cc=dennis.dalessandro@intel.com \
--cc=frederic@kernel.org \
--cc=hch@infradead.org \
--cc=helgaas@kernel.org \
--cc=intel-wired-lan@lists.osuosl.org \
--cc=jacob.e.keller@intel.com \
--cc=jeffrey.t.kirsher@intel.com \
--cc=jerinj@marvell.com \
--cc=jesse.brandeburg@intel.com \
--cc=jiri@nvidia.com \
--cc=jlelli@redhat.com \
--cc=juri.lelli@redhat.com \
--cc=lihong.yang@intel.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-pci@vger.kernel.org \
--cc=mathias.nyman@intel.com \
--cc=mike.marciniszyn@intel.com \
--cc=mingo@redhat.com \
--cc=mtosatti@redhat.com \
--cc=netdev@vger.kernel.org \
--cc=peterz@infradead.org \
--cc=sassmann@redhat.com \
--cc=thomas.lendacky@amd.com \
--cc=vincent.guittot@linaro.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).