linux-kernel - [PATCH v2 0/3] Preventing job distribution to isolated CPUs

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Message-Id: <20200622234510.240834-1-nitesh@redhat.com>
Date:   Mon, 22 Jun 2020 19:45:07 -0400
From:   Nitesh Narayan Lal <nitesh@...hat.com>
To:     linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
        frederic@...nel.org, mtosatti@...hat.com, juri.lelli@...hat.com,
        abelits@...vell.com, bhelgaas@...gle.com,
        linux-pci@...r.kernel.org, rostedt@...dmis.org, mingo@...nel.org,
        peterz@...radead.org, tglx@...utronix.de, davem@...emloft.net,
        akpm@...ux-foundation.org, sfr@...b.auug.org.au,
        stephen@...workplumber.org, rppt@...ux.vnet.ibm.com
Subject: [PATCH v2 0/3] Preventing job distribution to isolated CPUs        

Testing                                                                    
=======                                                                    
* Patch 1:                                                                 
  Fix for cpumask_local_spread() is tested by creating VFs, loading        
  iavf module and by adding a tracepoint to confirm that only housekeeping 
  CPUs are picked when an appropriate profile is set up and all remaining  
  CPUs when no CPU isolation is configured.                                

* Patch 2:                                                                 
  To test the PCI fix, I hotplugged a virtio-net-pci from qemu console     
  and forced its addition to a specific node to trigger the code path that 
  includes the proposed fix and verified that only housekeeping CPUs       
  are included via tracepoint.                                             

* Patch 3:                                                                 
  To test the fix in store_rps_map(), I tried configuring an isolated      
  CPU by writing to /sys/class/net/en*/queues/rx*/rps_cpus which           
  resulted in 'write error: Invalid argument' error. For the case          
  where a non-isolated CPU is writing in rps_cpus the above operation      
  succeeded without any error.                                             

Changes from v1:                                                           
===============                                                            
- Included the suggestions made by Bjorn Helgaas in the commit messages.    
- Included the 'Reviewed-by' and 'Acked-by' received for Patch-2.          

[1] https://patchwork.ozlabs.org/project/netdev/patch/51102eebe62336c6a4e584c7a503553b9f90e01c.camel@marvell.com/

Alex Belits (3):                                                           
  lib: Restrict cpumask_local_spread to houskeeping CPUs                   
  PCI: Restrict probe functions to housekeeping CPUs                       
  net: Restrict receive packets queuing to housekeeping CPUs               

 drivers/pci/pci-driver.c |  5 ++++-                                       
 lib/cpumask.c            | 43 +++++++++++++++++++++++-----------------    
 net/core/net-sysfs.c     | 10 +++++++++-                                  
 3 files changed, 38 insertions(+), 20 deletions(-)                        

--