linux-kernel - Re: [PATCH 0/3] perf jvmti: Various fixes to JVMTI agent

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Date:   Fri, 15 May 2020 15:45:09 +0800
From:   Nick Gasson <nick.gasson@....com>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Stephane Eranian <eranian@...gle.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <Mark.Rutland@....com>,
        Namhyung Kim <namhyung@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Arnaldo Carvalho de Melo" <arnaldo.melo@...il.com>
Subject: Re: [PATCH 0/3] perf jvmti: Various fixes to JVMTI agent

On 05/15/20 06:41 am, Ian Rogers wrote:
>
> If you are looking at this code I believe there is a bug in that the
> loop handling jvmtiCompiledMethodLoadInlineRecord is writing out the
> entire line number table before a pc and not just the line number
> table at the pc. This loop in do_get_line_numbers:
>
> if (loc_tab[i].start_location < bci) {
> tab[lines].pc = (unsigned long)pc;
> tab[lines].line_number = loc_tab[i].line_number;
> tab[lines].discrim = 0; /* not yet used */
> tab[lines].methodID = m;
> lines++;
> } else {
>
> It could possibly make sense if it were iterating over the inline data
> in the jvmtiCompiledMethodLoadInlineRecord rather than the line number
> table.
> Fixing this is toward the end of a list of things I need to look at.
>

OK sure, I'll have a look at this. Thanks for the reviews.

--
Thanks,
Nick