From: Peter Zijlstra <peterz@infradead.org>
To: Wei Wang <wei.w.wang@intel.com>
Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
pbonzini@redhat.com, ak@linux.intel.com, kan.liang@intel.com,
mingo@redhat.com, rkrcmar@redhat.com, like.xu@intel.com,
jannh@google.com, arei.gonglei@huawei.com
Subject: Re: [PATCH v3 5/5] KVM/x86/lbr: lazy save the guest lbr stack
Date: Thu, 20 Sep 2018 14:57:27 +0200 [thread overview]
Message-ID: <20180920125727.GV24124@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <5BA39968.8030309@intel.com>
On Thu, Sep 20, 2018 at 08:58:16PM +0800, Wei Wang wrote:
> On 09/20/2018 08:37 PM, Peter Zijlstra wrote:
> > On Thu, Sep 20, 2018 at 06:05:59PM +0800, Wei Wang wrote:
> > > /**
> > > + * lbr_select_user_callstack - check if the user callstack mode is set
> > > + *
> > > + * @lbr_select: the lbr select msr
> > > + *
> > > + * Returns: true if the msr is configured to the user callstack mode.
> > > + * Otherwise, false.
> > > + *
> > > + */
> > > +bool lbr_select_user_callstack(u64 lbr_select)
> > > +{
> > > + return !!(lbr_select & LBR_USER_CALLSTACK);
> > > +}
> > > +EXPORT_SYMBOL_GPL(lbr_select_user_callstack);
> > That function is pure and tiny, wth is that an exported symbol and not
> > an inline?
> Thanks Peter for the comments.
>
> Because this function uses the LBR_ macros which are defined in this lbr.c
> file.
> Do you think it would be OK to move all the above LBR_ macros to
> asm/perf_event.h?
Sure.
next prev parent reply other threads:[~2018-09-20 12:57 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-20 10:05 [PATCH v3 0/5] Guest LBR Enabling Wei Wang
2018-09-20 10:05 ` [PATCH v3 1/5] perf/x86: add a function to get the lbr stack Wei Wang
2018-09-20 12:05 ` Peter Zijlstra
2018-09-20 12:07 ` Peter Zijlstra
2018-09-20 10:05 ` [PATCH v3 2/5] KVM/x86: KVM_CAP_X86_GUEST_LBR Wei Wang
2018-09-20 10:05 ` [PATCH v3 3/5] KVM/x86: expose MSR_IA32_PERF_CAPABILITIES to the guest Wei Wang
2018-09-20 12:38 ` Wei Wang
2018-09-20 10:05 ` [PATCH v3 4/5] KVM/x86/vPMU: Add APIs to support host save/restore the guest lbr stack Wei Wang
2018-09-20 12:17 ` Peter Zijlstra
2018-09-20 12:32 ` Peter Zijlstra
2018-09-27 13:45 ` Wang, Wei W
2018-09-20 15:30 ` Andi Kleen
2018-09-20 16:24 ` Peter Zijlstra
2018-09-27 10:10 ` Wang, Wei W
2018-09-27 10:05 ` Wang, Wei W
2018-09-20 10:05 ` [PATCH v3 5/5] KVM/x86/lbr: lazy save " Wei Wang
2018-09-20 12:07 ` Gonglei (Arei)
2018-09-27 14:11 ` Wang, Wei W
2018-09-20 12:37 ` Peter Zijlstra
2018-09-20 12:58 ` Wei Wang
2018-09-20 12:57 ` Peter Zijlstra [this message]
2018-09-20 11:34 ` [PATCH v3 0/5] Guest LBR Enabling Gonglei (Arei)
2018-09-20 12:36 ` Wei Wang
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