linux-kernel - Re: [RFC/PATCH 09/38] perf record: Add --index option for building index table

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Message-ID: <20151005134641.GC26800@krava.landal.opennet>
Date:	Mon, 5 Oct 2015 15:46:41 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Stephane Eranian <eranian@...gle.com>,
	David Ahern <dsahern@...il.com>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [RFC/PATCH 09/38] perf record: Add --index option for building
 index table

On Fri, Oct 02, 2015 at 02:18:50PM +0900, Namhyung Kim wrote:

SNIP

> +static int record__merge_index_files(struct record *rec, int nr_index)
> +{
> +	int i;
> +	int ret = -ENOMEM;
> +	u64 offset;
> +	char path[PATH_MAX];
> +	struct perf_file_section *idx;
> +	struct perf_data_file *file = &rec->file;
> +	struct perf_session *session = rec->session;
> +	int output_fd = perf_data_file__fd(file);
> +
> +	/* +1 for header file itself */
> +	nr_index++;
> +
> +	idx = calloc(nr_index, sizeof(*idx));
> +	if (idx == NULL)
> +		goto out_close;
> +
> +	offset = lseek(output_fd, 0, SEEK_END);
> +
> +	idx[0].offset = session->header.data_offset;
> +	idx[0].size   = offset - idx[0].offset;
> +
> +	for (i = 1; i < nr_index; i++) {
> +		struct stat stbuf;
> +		int fd = rec->fds[i - 1];
> +
> +		ret = fstat(fd, &stbuf);
> +		if (ret < 0)
> +			goto out_close;
> +
> +		idx[i].offset = offset;
> +		idx[i].size   = stbuf.st_size;
> +
> +		offset += stbuf.st_size;
> +
> +		if (idx[i].size == 0)
> +			continue;
> +
> +		ret = copyfile_offset(fd, 0, output_fd, idx[i].offset,
> +				      idx[i].size);
> +		if (ret < 0)
> +			goto out_close;
> +	}
> +
> +	session->header.index = idx;
> +	session->header.nr_index = nr_index;
> +
> +	perf_has_index = true;

I might have asked earlier, but why is this global? seems like
perf_session member to me..

thanks,
jirka
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