Re: [PATCH 1/3] context_tracking: remove duplicate enabled check
On 28/10/2015 06:19, Andy Lutomirski wrote: > On Tue, Oct 27, 2015 at 6:39 PM, Paolo Bonzini wrote: >> All calls to context_tracking_enter and context_tracking_exit >> are already checking context_tracking_is_enabled, except the >> context_tracking_user_enter and context_tracking_user_exit >> functions left in for the benefit of assembly calls. >> >> Pull the check up to those functions, by making them simple >> wrappers around the user_enter and user_exit inline functions. > > This makes my brain hurt. Assuming that this survives a boot with > CONFIG_CONTEXT_TRACKING_FORCE=y and CONFIG_PROVE_LOCKING=y (with the > implied CONFIG_PROVE_RCU), then: > > Acked-by: Andy Lutomirski Tested now. Paolo -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [PATCH v1 2/2] dma-mapping-common: add DMA attribute - DMA_ATTR_IOMMU_BYPASS
On Thu, Nov 05, 2015 at 04:11:21PM -0500, David Miller wrote: > > And for the record Sowmini fixed a lot of the lock contention: > > commit ff7d37a502022149655c18035b99a53391be0383 > Author: Sowmini Varadhan > Date: Thu Apr 9 15:33:30 2015 -0400 > > Break up monolithic iommu table/lock into finer graularity pools and lock > The poor rds-stress results w/o IOMMU bypass I sent in early post were taken from kernel that has the above patch and that has all the needed changes in arch/sparc to use this new feature. It seems that it worked well for 10G ETH IOMMU lock contention but it still not solving the rds-stress issue. The difference can be from: 1. Lock contention still left with this enhancement <-- zero in bypass 2. Overhead to setup the IOMMU mapping <-- almost zero in bypass (require 1 HV call) 3. Overhead to use the IOMMU mapping <-- not sure how to measure this 4. Overhead to tear the IOMMU mapping <-- zero in bypass -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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