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Date:	Thu, 19 Jun 2014 12:38:51 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Jiri Olsa <jolsa@...nel.org>
Cc:	linux-kernel@...r.kernel.org,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH 1/5] perf tools: Factor ui_browser ops out of ui_browser
 struct

Em Thu, Jun 19, 2014 at 01:41:12PM +0200, Jiri Olsa escreveu:
> Separating ops out of 'struct ui_browser' into
> 'struct ui_browser_ops'.

You stated what you did, and that helps in understanding what this patch
is about, now we only need to have a paragraph on _why_ this is needed
:-)

So, what is the intent of this patch? Why do we need it?
 
> Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
> Cc: Corey Ashford <cjashfor@...ux.vnet.ibm.com>
> Cc: David Ahern <dsahern@...il.com>
> Cc: Frederic Weisbecker <fweisbec@...il.com>
> Cc: Ingo Molnar <mingo@...nel.org>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> ---
>  tools/perf/ui/browser.c           | 37 ++++++++++++++++++++++---------------
>  tools/perf/ui/browser.h           | 28 +++++++++++++++++-----------
>  tools/perf/ui/browsers/annotate.c | 19 +++++++++++--------
>  tools/perf/ui/browsers/header.c   |  8 +++++---
>  tools/perf/ui/browsers/hists.c    | 14 ++++++++------
>  tools/perf/ui/browsers/map.c      |  8 +++++---
>  tools/perf/ui/browsers/scripts.c  |  2 +-
>  tools/perf/ui/tui/util.c          |  8 +++++---
>  8 files changed, 74 insertions(+), 50 deletions(-)
> 
> diff --git a/tools/perf/ui/browser.c b/tools/perf/ui/browser.c
> index 3ccf6e1..e6f96be 100644
> --- a/tools/perf/ui/browser.c
> +++ b/tools/perf/ui/browser.c
> @@ -46,12 +46,18 @@ void ui_browser__gotorc(struct ui_browser *browser, int y, int x)
>  	SLsmg_gotorc(browser->y + y, browser->x + x);
>  }
>  
> +static bool ui_browser__filter(struct ui_browser *browser, void *entry)
> +{
> +	return browser->ops.filter ? browser->ops.filter(browser, entry) :
> +				     false;
> +}
> +
>  static struct list_head *
>  ui_browser__list_head_filter_entries(struct ui_browser *browser,
>  				     struct list_head *pos)
>  {
>  	do {
> -		if (!browser->filter || !browser->filter(browser, pos))
> +		if (!ui_browser__filter(browser, pos))
>  			return pos;
>  		pos = pos->next;
>  	} while (pos != browser->entries);
> @@ -64,7 +70,7 @@ ui_browser__list_head_filter_prev_entries(struct ui_browser *browser,
>  					  struct list_head *pos)
>  {
>  	do {
> -		if (!browser->filter || !browser->filter(browser, pos))
> +		if (!ui_browser__filter(browser, pos))
>  			return pos;
>  		pos = pos->prev;
>  	} while (pos != browser->entries);
> @@ -149,7 +155,7 @@ unsigned int ui_browser__rb_tree_refresh(struct ui_browser *browser)
>  
>  	while (nd != NULL) {
>  		ui_browser__gotorc(browser, row, 0);
> -		browser->write(browser, nd, row);
> +		browser->ops.write(browser, nd, row);
>  		if (++row == browser->height)
>  			break;
>  		nd = rb_next(nd);
> @@ -227,7 +233,7 @@ bool ui_browser__dialog_yesno(struct ui_browser *browser, const char *text)
>  void ui_browser__reset_index(struct ui_browser *browser)
>  {
>  	browser->index = browser->top_idx = 0;
> -	browser->seek(browser, 0, SEEK_SET);
> +	browser->ops.seek(browser, 0, SEEK_SET);
>  }
>  
>  void __ui_browser__show_title(struct ui_browser *browser, const char *title)
> @@ -302,7 +308,7 @@ static int __ui_browser__refresh(struct ui_browser *browser)
>  	int row;
>  	int width = browser->width;
>  
> -	row = browser->refresh(browser);
> +	row = browser->ops.refresh(browser);
>  	ui_browser__set_color(browser, HE_COLORSET_NORMAL);
>  
>  	if (!browser->use_navkeypressed || browser->navkeypressed)
> @@ -346,11 +352,12 @@ void ui_browser__update_nr_entries(struct ui_browser *browser, u32 nr_entries)
>  	}
>  
>  	browser->top = NULL;
> -	browser->seek(browser, browser->top_idx, SEEK_SET);
> +	browser->ops.seek(browser, browser->top_idx, SEEK_SET);
>  }
>  
>  int ui_browser__run(struct ui_browser *browser, int delay_secs)
>  {
> +	struct ui_browser_ops *ops = &browser->ops;
>  	int err, key;
>  
>  	while (1) {
> @@ -391,7 +398,7 @@ int ui_browser__run(struct ui_browser *browser, int delay_secs)
>  			++browser->index;
>  			if (browser->index == browser->top_idx + browser->height) {
>  				++browser->top_idx;
> -				browser->seek(browser, +1, SEEK_CUR);
> +				ops->seek(browser, +1, SEEK_CUR);
>  			}
>  			break;
>  		case K_UP:
> @@ -400,7 +407,7 @@ int ui_browser__run(struct ui_browser *browser, int delay_secs)
>  			--browser->index;
>  			if (browser->index < browser->top_idx) {
>  				--browser->top_idx;
> -				browser->seek(browser, -1, SEEK_CUR);
> +				ops->seek(browser, -1, SEEK_CUR);
>  			}
>  			break;
>  		case K_PGDN:
> @@ -413,7 +420,7 @@ int ui_browser__run(struct ui_browser *browser, int delay_secs)
>  				offset = browser->nr_entries - 1 - browser->index;
>  			browser->index += offset;
>  			browser->top_idx += offset;
> -			browser->seek(browser, +offset, SEEK_CUR);
> +			ops->seek(browser, +offset, SEEK_CUR);
>  			break;
>  		case K_PGUP:
>  			if (browser->top_idx == 0)
> @@ -426,7 +433,7 @@ int ui_browser__run(struct ui_browser *browser, int delay_secs)
>  
>  			browser->index -= offset;
>  			browser->top_idx -= offset;
> -			browser->seek(browser, -offset, SEEK_CUR);
> +			ops->seek(browser, -offset, SEEK_CUR);
>  			break;
>  		case K_HOME:
>  			ui_browser__reset_index(browser);
> @@ -438,7 +445,7 @@ int ui_browser__run(struct ui_browser *browser, int delay_secs)
>  
>  			browser->index = browser->nr_entries - 1;
>  			browser->top_idx = browser->index - offset;
> -			browser->seek(browser, -offset, SEEK_END);
> +			ops->seek(browser, -offset, SEEK_END);
>  			break;
>  		default:
>  			return key;
> @@ -459,9 +466,9 @@ unsigned int ui_browser__list_head_refresh(struct ui_browser *browser)
>  	pos = browser->top;
>  
>  	list_for_each_from(pos, head) {
> -		if (!browser->filter || !browser->filter(browser, pos)) {
> +		if (!ui_browser__filter(browser, pos)) {
>  			ui_browser__gotorc(browser, row, 0);
> -			browser->write(browser, pos, row);
> +			browser->ops.write(browser, pos, row);
>  			if (++row == browser->height)
>  				break;
>  		}
> @@ -584,9 +591,9 @@ unsigned int ui_browser__argv_refresh(struct ui_browser *browser)
>  
>  	pos = (char **)browser->top;
>  	while (idx < browser->nr_entries) {
> -		if (!browser->filter || !browser->filter(browser, *pos)) {
> +		if (!ui_browser__filter(browser, *pos)) {
>  			ui_browser__gotorc(browser, row, 0);
> -			browser->write(browser, pos, row);
> +			browser->ops.write(browser, pos, row);
>  			if (++row == browser->height)
>  				break;
>  		}
> diff --git a/tools/perf/ui/browser.h b/tools/perf/ui/browser.h
> index 03d4d62..5887ca7 100644
> --- a/tools/perf/ui/browser.h
> +++ b/tools/perf/ui/browser.h
> @@ -11,21 +11,27 @@
>  #define HE_COLORSET_ADDR	55
>  #define HE_COLORSET_ROOT	56
>  
> -struct ui_browser {
> -	u64	      index, top_idx;
> -	void	      *top, *entries;
> -	u16	      y, x, width, height;
> -	int	      current_color;
> -	void	      *priv;
> -	const char    *title;
> -	char	      *helpline;
> +struct ui_browser;
> +
> +struct ui_browser_ops {
>  	unsigned int  (*refresh)(struct ui_browser *browser);
>  	void	      (*write)(struct ui_browser *browser, void *entry, int row);
>  	void	      (*seek)(struct ui_browser *browser, off_t offset, int whence);
>  	bool	      (*filter)(struct ui_browser *browser, void *entry);
> -	u32	      nr_entries;
> -	bool	      navkeypressed;
> -	bool	      use_navkeypressed;
> +};
> +
> +struct ui_browser {
> +	u64			index, top_idx;
> +	void			*top, *entries;
> +	u16			y, x, width, height;
> +	int			current_color;
> +	void			*priv;
> +	const char		*title;
> +	char			*helpline;
> +	u32			nr_entries;
> +	bool			navkeypressed;
> +	bool			use_navkeypressed;
> +	struct ui_browser_ops	ops;
>  };
>  
>  int  ui_browser__set_color(struct ui_browser *browser, int color);
> diff --git a/tools/perf/ui/browsers/annotate.c b/tools/perf/ui/browsers/annotate.c
> index f0697a3..bc4bcfa 100644
> --- a/tools/perf/ui/browsers/annotate.c
> +++ b/tools/perf/ui/browsers/annotate.c
> @@ -388,8 +388,9 @@ static bool annotate_browser__toggle_source(struct annotate_browser *browser)
>  	struct disasm_line *dl;
>  	struct browser_disasm_line *bdl;
>  	off_t offset = browser->b.index - browser->b.top_idx;
> +	struct ui_browser_ops *ops = &browser->b.ops;
>  
> -	browser->b.seek(&browser->b, offset, SEEK_CUR);
> +	ops->seek(&browser->b, offset, SEEK_CUR);
>  	dl = list_entry(browser->b.top, struct disasm_line, node);
>  	bdl = disasm_line__browser(dl);
>  
> @@ -399,13 +400,13 @@ static bool annotate_browser__toggle_source(struct annotate_browser *browser)
>  
>  		browser->b.nr_entries = browser->nr_entries;
>  		annotate_browser__opts.hide_src_code = false;
> -		browser->b.seek(&browser->b, -offset, SEEK_CUR);
> +		ops->seek(&browser->b, -offset, SEEK_CUR);
>  		browser->b.top_idx = bdl->idx - offset;
>  		browser->b.index = bdl->idx;
>  	} else {
>  		if (bdl->idx_asm < 0) {
>  			ui_helpline__puts("Only available for assembly lines.");
> -			browser->b.seek(&browser->b, -offset, SEEK_CUR);
> +			ops->seek(&browser->b, -offset, SEEK_CUR);
>  			return false;
>  		}
>  
> @@ -414,7 +415,7 @@ static bool annotate_browser__toggle_source(struct annotate_browser *browser)
>  
>  		browser->b.nr_entries = browser->nr_asm_entries;
>  		annotate_browser__opts.hide_src_code = true;
> -		browser->b.seek(&browser->b, -offset, SEEK_CUR);
> +		ops->seek(&browser->b, -offset, SEEK_CUR);
>  		browser->b.top_idx = bdl->idx_asm - offset;
>  		browser->b.index = bdl->idx_asm;
>  	}
> @@ -882,10 +883,12 @@ int symbol__tui_annotate(struct symbol *sym, struct map *map,
>  	};
>  	struct annotate_browser browser = {
>  		.b = {
> -			.refresh = annotate_browser__refresh,
> -			.seek	 = ui_browser__list_head_seek,
> -			.write	 = annotate_browser__write,
> -			.filter  = disasm_line__filter,
> +			.ops = {
> +				.refresh = annotate_browser__refresh,
> +				.seek	 = ui_browser__list_head_seek,
> +				.write	 = annotate_browser__write,
> +				.filter  = disasm_line__filter,
> +			},
>  			.priv	 = &ms,
>  			.use_navkeypressed = true,
>  		},
> diff --git a/tools/perf/ui/browsers/header.c b/tools/perf/ui/browsers/header.c
> index 89c16b9..69f1929 100644
> --- a/tools/perf/ui/browsers/header.c
> +++ b/tools/perf/ui/browsers/header.c
> @@ -81,10 +81,12 @@ static int ui__list_menu(int argc, char * const argv[])
>  {
>  	struct ui_browser menu = {
>  		.entries    = (void *)argv,
> -		.refresh    = ui_browser__argv_refresh,
> -		.seek	    = ui_browser__argv_seek,
> -		.write	    = ui_browser__argv_write,
>  		.nr_entries = argc,
> +		.ops = {
> +			.refresh    = ui_browser__argv_refresh,
> +			.seek	    = ui_browser__argv_seek,
> +			.write	    = ui_browser__argv_write,
> +		},
>  	};
>  
>  	return list_menu__run(&menu);
> diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
> index 04a229a..7cb6309 100644
> --- a/tools/perf/ui/browsers/hists.c
> +++ b/tools/perf/ui/browsers/hists.c
> @@ -1190,8 +1190,8 @@ static struct hist_browser *hist_browser__new(struct hists *hists)
>  
>  	if (browser) {
>  		browser->hists = hists;
> -		browser->b.refresh = hist_browser__refresh;
> -		browser->b.seek = ui_browser__hists_seek;
> +		browser->b.ops.refresh = hist_browser__refresh;
> +		browser->b.ops.seek = ui_browser__hists_seek;
>  		browser->b.use_navkeypressed = true;
>  	}
>  
> @@ -1947,11 +1947,13 @@ static int __perf_evlist__tui_browse_hists(struct perf_evlist *evlist,
>  	struct perf_evsel *pos;
>  	struct perf_evsel_menu menu = {
>  		.b = {
> +			.ops = {
> +				.refresh    = ui_browser__list_head_refresh,
> +				.seek	    = ui_browser__list_head_seek,
> +				.write	    = perf_evsel_menu__write,
> +				.filter	    = filter_group_entries,
> +			},
>  			.entries    = &evlist->entries,
> -			.refresh    = ui_browser__list_head_refresh,
> -			.seek	    = ui_browser__list_head_seek,
> -			.write	    = perf_evsel_menu__write,
> -			.filter	    = filter_group_entries,
>  			.nr_entries = nr_entries,
>  			.priv	    = evlist,
>  		},
> diff --git a/tools/perf/ui/browsers/map.c b/tools/perf/ui/browsers/map.c
> index b11639f..6b09cd6 100644
> --- a/tools/perf/ui/browsers/map.c
> +++ b/tools/perf/ui/browsers/map.c
> @@ -103,9 +103,11 @@ int map__browse(struct map *map)
>  	struct map_browser mb = {
>  		.b = {
>  			.entries = &map->dso->symbols[map->type],
> -			.refresh = ui_browser__rb_tree_refresh,
> -			.seek	 = ui_browser__rb_tree_seek,
> -			.write	 = map_browser__write,
> +			.ops = {
> +				.refresh = ui_browser__rb_tree_refresh,
> +				.seek	 = ui_browser__rb_tree_seek,
> +				.write	 = map_browser__write,
> +			},
>  		},
>  		.map = map,
>  	};
> diff --git a/tools/perf/ui/browsers/scripts.c b/tools/perf/ui/browsers/scripts.c
> index 402d2bd..bbbc442 100644
> --- a/tools/perf/ui/browsers/scripts.c
> +++ b/tools/perf/ui/browsers/scripts.c
> @@ -116,7 +116,7 @@ int script_browse(const char *script_opt)
>  	struct script_line *sline;
>  
>  	struct perf_script_browser script = {
> -		.b = {
> +		.b.ops = {
>  			.refresh    = ui_browser__list_head_refresh,
>  			.seek	    = ui_browser__list_head_seek,
>  			.write	    = script_browser__write,
> diff --git a/tools/perf/ui/tui/util.c b/tools/perf/ui/tui/util.c
> index bf890f7..8ac0465 100644
> --- a/tools/perf/ui/tui/util.c
> +++ b/tools/perf/ui/tui/util.c
> @@ -60,10 +60,12 @@ int ui__popup_menu(int argc, char * const argv[])
>  {
>  	struct ui_browser menu = {
>  		.entries    = (void *)argv,
> -		.refresh    = ui_browser__argv_refresh,
> -		.seek	    = ui_browser__argv_seek,
> -		.write	    = ui_browser__argv_write,
>  		.nr_entries = argc,
> +		.ops        = {
> +			.refresh    = ui_browser__argv_refresh,
> +			.seek	    = ui_browser__argv_seek,
> +			.write	    = ui_browser__argv_write,
> +		},
>  	};
>  
>  	return popup_menu__run(&menu);
> -- 
> 1.8.3.1
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