linux-kernel - Re: [PATCH 2/3] x86/xen: move paravirt lazy code

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Date:   Wed, 13 Sep 2023 15:36:16 +0200
From:   Juergen Gross <jgross@...e.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        virtualization@...ts.linux-foundation.org,
        linux-trace-kernel@...r.kernel.org, Ajay Kaher <akaher@...are.com>,
        Alexey Makhalov <amakhalov@...are.com>,
        VMware PV-Drivers Reviewers <pv-drivers@...are.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        xen-devel@...ts.xenproject.org
Subject: Re: [PATCH 2/3] x86/xen: move paravirt lazy code

On 13.09.23 15:26, Steven Rostedt wrote:
> On Wed, 13 Sep 2023 13:38:27 +0200
> Juergen Gross <jgross@...e.com> wrote:
> 
>> diff --git a/include/trace/events/xen.h b/include/trace/events/xen.h
>> index 44a3f565264d..0577f0cdd231 100644
>> --- a/include/trace/events/xen.h
>> +++ b/include/trace/events/xen.h
>> @@ -6,26 +6,26 @@
>>   #define _TRACE_XEN_H
>>   
>>   #include <linux/tracepoint.h>
>> -#include <asm/paravirt_types.h>
>> +#include <asm/xen/hypervisor.h>
>>   #include <asm/xen/trace_types.h>
>>   
>>   struct multicall_entry;
>>   
>>   /* Multicalls */
>>   DECLARE_EVENT_CLASS(xen_mc__batch,
>> -	    TP_PROTO(enum paravirt_lazy_mode mode),
>> +	    TP_PROTO(enum xen_lazy_mode mode),
>>   	    TP_ARGS(mode),
>>   	    TP_STRUCT__entry(
>> -		    __field(enum paravirt_lazy_mode, mode)
>> +		    __field(enum xen_lazy_mode, mode)
>>   		    ),
>>   	    TP_fast_assign(__entry->mode = mode),
>>   	    TP_printk("start batch LAZY_%s",
>> -		      (__entry->mode == PARAVIRT_LAZY_MMU) ? "MMU" :
>> -		      (__entry->mode == PARAVIRT_LAZY_CPU) ? "CPU" : "NONE")
>> +		      (__entry->mode == XEN_LAZY_MMU) ? "MMU" :
>> +		      (__entry->mode == XEN_LAZY_CPU) ? "CPU" : "NONE")
> 
> There's helper functions that make the above easier to implement as well as
> exports the symbols so that user space can parse this better:
> 
> TRACE_DEFINE_ENUM(XEN_LAZY_NONE);
> TRACE_DEFINE_ENUM(XEN_LAZY_MMU);
> TRACE_DEFINE_ENUM(XEN_LAZY_CPU);
> 
> [..]
> 
>    	    TP_printk("start batch LAZY_%s",
> 		      __print_symbolic(mode,
> 				       { XEN_LAZY_NONE, "NONE" },
> 				       { XEN_LAZY_MMU,  "MMU   },
> 				       { XEN_LAZY_CPU,  "CPU"  }))
> 
> Then user space parsers that read the raw data can convert these events
> into something humans can read.

Thanks. I'll add that to another patch I'm just writing for cleaning up
include/trace/events/xen.h (some defined trace events are no longer used).


Juergen

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