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Re: [Qemu-devel] [RFC 00/11] Current MTTCG kvm-unit-test patches
From: |
Alex Bennée |
Subject: |
Re: [Qemu-devel] [RFC 00/11] Current MTTCG kvm-unit-test patches |
Date: |
Fri, 26 Feb 2016 14:54:33 +0000 |
User-agent: |
mu4e 0.9.17; emacs 25.0.91.1 |
Andrew Jones <address@hidden> writes:
> On Fri, Feb 26, 2016 at 01:15:22PM +0000, Alex Bennée wrote:
>> Hi,
>>
>> Some of these patches have been posted before and previous patches
>> have already been accepted upstream so I'm tagging this as a new RFC
>> series.
>>
>> This is a series of tests built around kvm-unit-tests but built with
>> the express purpose of stressing the TCG, in particular MTTCG builds.
>>
>> Changes from previous appearances:
>>
>> * Separated locking and barrier tests
>> * Included Drew's IPI patches (used in tcg-test)
>> * New TCG chaining test
>>
>> The new barrier tests really only fails when running on MTTCG builds on
>> a weak backend. Many thanks to Will Deacon for helping me get a
>> working test case at the last Connect.
>>
>> I'm mainly posting these for reference for others testing MTTCG as
>> I've still got to check I've addressed any outstanding review
>> comments. However there has been enough code churn some of the
>> comments may no longer be relevant.
>>
>> The TCG tests are also useful as benchmarks for comparing the cost of
>> having chained basic blocks versus exiting the loop every time. The
>> pathological case is the computed jumps test as all the addresses are
>> within a PAGE_SIZE boundary the tb_jump_cache has no effect meaning a
>> full look up each time.
>>
>> Alex Bennée (8):
>> config/config-arm-common: build-up tests-common target
>> lib: add isaac prng library from CCAN
>> arm/run: set indentation defaults for emacs
>> arm/run: allow aarch64 to start arm binaries
>> arm/tlbflush-test: Add TLB torture test
>> arm/locking-tests: add comprehensive locking test
>> arm/barrier-litmus-tests: add some litmus tests
>> arm/tcg-test: some basic TCG exercising tests
>>
>> Andrew Jones (3):
>> arm/arm64: irq enable/disable
>> arm/arm64: Add initial gic support
>> arm/arm64: Add IPI test
>
> I've actually updated these patches a bit, and started extending the
> series to also work with a v3 gic. I'll pick that back up and get it
> posted for you (hopefully next week). Or I'll at least update my
> arm/ipi-test branch with the changes I've made for gicv2...
Cool.
One thing I noticed was a slight disparity between the number of IPI
IRQs sent and the number received. However I'm assuming this could well
be without any explicit synchronisation a second IPI can get swallowed
up if the first hasn't been acknowledged yet.
Is there any sane/safe way for gic_send_sgi to know if the IRQ was
pending when it flips the bit?
>
> drew
--
Alex Bennée
- [Qemu-devel] [RFC 06/11] arm/run: set indentation defaults for emacs, (continued)
- [Qemu-devel] [RFC 06/11] arm/run: set indentation defaults for emacs, Alex Bennée, 2016/02/26
- [Qemu-devel] [RFC 08/11] arm/tlbflush-test: Add TLB torture test, Alex Bennée, 2016/02/26
- [Qemu-devel] [RFC 10/11] arm/barrier-litmus-tests: add some litmus tests, Alex Bennée, 2016/02/26
- [Qemu-devel] [RFC 05/11] lib: add isaac prng library from CCAN, Alex Bennée, 2016/02/26
- [Qemu-devel] [RFC 07/11] arm/run: allow aarch64 to start arm binaries, Alex Bennée, 2016/02/26
- [Qemu-devel] [RFC 09/11] arm/locking-tests: add comprehensive locking test, Alex Bennée, 2016/02/26
- [Qemu-devel] [RFC 11/11] arm/tcg-test: some basic TCG exercising tests, Alex Bennée, 2016/02/26
- Re: [Qemu-devel] [RFC 00/11] Current MTTCG kvm-unit-test patches, Andrew Jones, 2016/02/26
- Re: [Qemu-devel] [RFC 00/11] Current MTTCG kvm-unit-test patches,
Alex Bennée <=