linux-kernel - Re: [PATCH 15/24] kvm: mmu: Wrap mmu_lock cond

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Message-ID: <fae0e326-cfd4-bf5d-97b5-ae632fb2de34@redhat.com>
Date:   Tue, 26 Jan 2021 18:55:13 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Ben Gardon <bgardon@...gle.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>, kvm <kvm@...r.kernel.org>,
        Peter Xu <peterx@...hat.com>, Peter Shier <pshier@...gle.com>,
        Peter Feiner <pfeiner@...gle.com>,
        Junaid Shahid <junaids@...gle.com>,
        Jim Mattson <jmattson@...gle.com>,
        Yulei Zhang <yulei.kernel@...il.com>,
        Wanpeng Li <kernellwp@...il.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Xiao Guangrong <xiaoguangrong.eric@...il.com>
Subject: Re: [PATCH 15/24] kvm: mmu: Wrap mmu_lock cond_resched and needbreak

On 26/01/21 18:47, Ben Gardon wrote:
> Enough that it motivated me to implement this more complex union
> scheme. While the difference was pronounced in the dirty log perf test
> microbenchmark, it's an open question as to whether it would matter in
> practice.

I'll look at getting some numbers if it's just the dirty log perf test. 
  Did you see anything in the profile pointing specifically at rwlock?

Paolo