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Date: Sat, 21 Apr 2012 10:01:13 +0900 From: Takuya Yoshikawa <takuya.yoshikawa@...il.com> To: Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com> Cc: Avi Kivity <avi@...hat.com>, Marcelo Tosatti <mtosatti@...hat.com>, LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org> Subject: Re: [PATCH v2 07/16] KVM: MMU: introduce for_each_pte_list_spte Sorry for the delay. On Wed, 18 Apr 2012 12:01:03 +0800 Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com> wrote: > > I have checked dirty-log-perf myself with this patch [01-07]. > > > > GET_DIRTY_LOG for 1GB dirty pages has become more than 15% slower. > Thanks for your test! > > Unbelievable, i will do more test and check it more carefully. GET_DIRTY_LOG now traverses rmap lists intensively. So only a small change can affect the performance when there are many dirty pages. > Could you please open your tool, then i can reproduction it and find the > real reason? It's already in kvm unit tests! > I will check whether your tool is better then kernbench/autotest after > review your tool. Let's focus on "lock-less" now: so dirty-log-perf is not needed now. I think you failed to appeal the real advantage of your "lock-less" approach! I will write about this on v3-threads. Thanks, Takuya -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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