linux-kernel - Re: [PATCH 7/7] perf tools: add feature header record to pipe-mode

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Date:   Thu, 18 May 2017 18:13:10 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     David Carrillo-Cisneros <davidcc@...gle.com>
Cc:     linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>, Simon Que <sque@...omium.org>,
        Wang Nan <wangnan0@...wei.com>, Jiri Olsa <jolsa@...nel.org>,
        He Kuang <hekuang@...wei.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        David Ahern <dsa@...ulusnetworks.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Stephane Eranian <eranian@...gle.com>,
        Paul Turner <pjt@...gle.com>
Subject: Re: [PATCH 7/7] perf tools: add feature header record to pipe-mode

On Wed, May 17, 2017 at 09:16:02PM -0700, David Carrillo-Cisneros wrote:

SNIP

>  struct header_print_data {
> @@ -2218,33 +2258,33 @@ int perf_header__fprintf_info(struct perf_session *session, FILE *fp, bool full)
>  	return 0;
>  }
>  
> -static int do_write_feat(struct feat_fd *fd, struct perf_header *h, int type,
> +static int do_write_feat(struct feat_fd *fdd, int type,
>  			 struct perf_file_section **p,
>  			 struct perf_evlist *evlist)
>  {
>  	int err;
>  	int ret = 0;
>  
> -	if (perf_header__has_feat(h, type)) {
> +	if (perf_header__has_feat(fdd->ph, type)) {

please do these changes in the earlier patch that introduced
the feat_fd as parameter in do_write_feat function

thanks,
jirka

>  		if (!feat_ops[type].write)
>  			return -1;
>  
> -		if (fd->buf) {
> -			pr_err("do_write_feat to memory buffer\n");
> +		if (fdd->buf) {
> +			pr_debug("Called do_write_feat for memory buffer\n");
>  			return -1;
>  		}
> -		(*p)->offset = lseek(fd->fd, 0, SEEK_CUR);
> +		(*p)->offset = lseek(fdd->fd, 0, SEEK_CUR);
>  
> -		err = feat_ops[type].write(fd, evlist);
> +		err = feat_ops[type].write(fdd, evlist);
>  		if (err < 0) {
>  			pr_debug("failed to write feature %s\n", feat_ops[type].name);
>  
>  			/* undo anything written */
> -			lseek(fd->fd, (*p)->offset, SEEK_SET);
> +			lseek(fdd->fd, (*p)->offset, SEEK_SET);
>  
>  			return -1;
>  		}
> -		(*p)->size = lseek(fd->fd, 0, SEEK_CUR) - (*p)->offset;
> +		(*p)->size = lseek(fdd->fd, 0, SEEK_CUR) - (*p)->offset;
>  		(*p)++;
>  	}
>  	return ret;
> @@ -2261,10 +2301,6 @@ static int perf_header__adds_write(struct perf_header *header,
>  	int feat;
>  	int err;
>  
> -	/*
> -	 * may write more than needed due to dropped feature, but
> -	 * this is okay, reader will skip the mising entries
> -	 */
>  	fdd = (struct feat_fd){
>  		.fd  = fd,
>  		.ph = header,
> @@ -2284,7 +2320,7 @@ static int perf_header__adds_write(struct perf_header *header,
>  	lseek(fd, sec_start + sec_size, SEEK_SET);
>  
>  	for_each_set_bit(feat, header->adds_features, HEADER_FEAT_BITS) {
> -		if (do_write_feat(&fdd, header, feat, &p, evlist))
> +		if (do_write_feat(&fdd, feat, &p, evlist))
>  			perf_header__clear_feat(header, feat);

SNIP