linux-kernel - RE: [patch 9/9] x86, bts, ftrace: a BTS ftrace plug-in prototype

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Message-ID: <928CFBE8E7CB0040959E56B4EA41A77E08F3C3A1@irsmsx504.ger.corp.intel.com>
Date:	Tue, 25 Nov 2008 11:23:09 +0000
From:	"Metzger, Markus T" <markus.t.metzger@...el.com>
To:	Frédéric Weisbecker <fweisbec@...il.com>
CC:	"hpa@...or.com" <hpa@...or.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"markus.t.metzger@...il.com" <markus.t.metzger@...il.com>,
	"roland@...hat.com" <roland@...hat.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"mtk.manpages@...il.com" <mtk.manpages@...il.com>,
	"eranian@...glemail.com" <eranian@...glemail.com>,
	"Villacis, Juan" <juan.villacis@...el.com>,
	Andi Kleen <andi@...stfloor.org>
Subject: RE: [patch 9/9] x86, bts, ftrace: a BTS ftrace plug-in prototype

>-----Original Message-----
>From: Frédéric Weisbecker [mailto:fweisbec@...il.com] 
>Sent: Dienstag, 25. November 2008 11:40
>To: Metzger, Markus T

>2008/11/25 Markus Metzger <markus.t.metzger@...el.com>:
>> +static enum print_line_t bts_trace_print_line(struct 
>trace_iterator *iter)
>> +{
>> +       struct trace_entry *entry = iter->ent;
>> +       struct trace_seq *seq = &iter->seq;
>> +       struct bts_entry *it;
>> +
>> +       trace_assign_type(it, entry);
>> +
>> +       if (entry->type == TRACE_BTS) {
>> +               int ret;
>> +#ifdef CONFIG_KALLSYMS
>> +               char function[KSYM_SYMBOL_LEN];
>> +               sprint_symbol(function, it->from);
>> +#else
>> +               char *function = "<unknown>";
>> +#endif
>> +
>> +               ret = trace_seq_printf(seq, "%4d  0x%lx -> 
>0x%lx [%s]\n",
>> +                                      entry->cpu, it->from, 
>it->to, function);
>
>
>You can use seq_print_ip_sym() which handles the ifdef and the 
>sprint_symbol...

Thanks.


>> +void trace_bts(struct trace_array *tr, unsigned long from, 
>unsigned long to)
>> +{
>> +       struct ring_buffer_event *event;
>> +       struct bts_entry *entry;
>> +       unsigned long irq;
>> +
>> +       event = ring_buffer_lock_reserve(tr->buffer, 
>sizeof(*entry), &irq);
>> +       if (!event)
>> +               return;
>> +       entry   = ring_buffer_event_data(event);
>> +       tracing_generic_entry_update(&entry->ent, 0, from);
>> +       entry->ent.type = TRACE_BTS;
>> +       entry->ent.cpu = smp_processor_id();
>
>
>If you look at the struct trace_entry, you will see find the cpu
>field. It is already inserted automatically :-)

I am using that field in struct trace_entry.

Without the assignment, though, I've seen funny cpu numbers. It seems that the field is not filled automatically.


regards,
markus.
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