linux-kernel - Re: [PATCH v2 perf,bpf 01/11] perf, bpf: consider events with attr.bpf

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Message-ID: <ECDC9D1F-3AA3-451A-BAC7-E089D4CAAEEC@fb.com>
Date:   Fri, 15 Feb 2019 17:02:02 +0000
From:   Song Liu <songliubraving@...com>
To:     Arnaldo Carvalho de Melo <acme@...hat.com>
CC:     Netdev <netdev@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        "Daniel Borkmann" <daniel@...earbox.net>,
        Kernel Team <Kernel-team@...com>,
        "Peter Zijlstra" <peterz@...radead.org>,
        "jolsa@...nel.org" <jolsa@...nel.org>,
        "namhyung@...nel.org" <namhyung@...nel.org>
Subject: Re: [PATCH v2 perf,bpf 01/11] perf, bpf: consider events with
 attr.bpf_event as side-band events



> On Feb 15, 2019, at 6:14 AM, Arnaldo Carvalho de Melo <acme@...hat.com> wrote:
> 
> Em Thu, Feb 14, 2019 at 03:58:40PM -0800, Song Liu escreveu:
>> Events with bpf_event should be considered as side-band event, as they
>> carry information about BPF programs.
>> 
>> Fixes: 6ee52e2a3fe4 ("perf, bpf: Introduce PERF_RECORD_BPF_EVENT")
>> Signed-off-by: Song Liu <songliubraving@...com>
>> ---
>> kernel/events/core.c | 3 ++-
>> 1 file changed, 2 insertions(+), 1 deletion(-)
>> 
>> diff --git a/kernel/events/core.c b/kernel/events/core.c
>> index 0a8dab322111..9403bdda5f8c 100644
>> --- a/kernel/events/core.c
>> +++ b/kernel/events/core.c
>> @@ -4238,7 +4238,8 @@ static bool is_sb_event(struct perf_event *event)
>> 	if (attr->mmap || attr->mmap_data || attr->mmap2 ||
>> 	    attr->comm || attr->comm_exec ||
>> 	    attr->task || attr->ksymbol ||
				^ here

>> -	    attr->context_switch)
>> +	    attr->context_switch ||
>> +	    attr->bpf_event)
> 
> What about attr->ksymbol?
> 
> - Arnaldo

It is already included up there. attr->bpf_event was missed initially 
because we didn't use events with bpf_event but not ksymbol. With this 
set, the polling thread only has bpf_event, so we need this fix. 

Thanks,
Song