linux-kernel - Re: [PATCH] perf callchain: Remove unused callchain_branch

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Message-ID: <ZwYVCTsf8p3v22HQ@google.com>
Date: Tue, 8 Oct 2024 22:30:49 -0700
From: Namhyung Kim <namhyung@...nel.org>
To: linux@...blig.org, kan.liang@...ux.intel.com
Cc: peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
	mark.rutland@....com, alexander.shishkin@...ux.intel.com,
	jolsa@...nel.org, irogers@...gle.com, adrian.hunter@...el.com,
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf callchain: Remove unused callchain_branch_counts

On Sun, Oct 06, 2024 at 02:22:04AM +0100, linux@...blig.org wrote:
> From: "Dr. David Alan Gilbert" <linux@...blig.org>
> 
> callchain_branch_counts() was added in 2016 by commit
> 3dd029ef9401 ("perf report: Calculate and return the branch flag counting")
> but unused.
> 
> Remove it and it's helpers.

Kan, are you ok with this?

Thanks,
Namhyung

> 
> Signed-off-by: Dr. David Alan Gilbert <linux@...blig.org>
> ---
>  tools/perf/util/callchain.c | 71 -------------------------------------
>  tools/perf/util/callchain.h |  4 ---
>  2 files changed, 75 deletions(-)
> 
> diff --git a/tools/perf/util/callchain.c b/tools/perf/util/callchain.c
> index 0c7564747a14..11435b72afbe 100644
> --- a/tools/perf/util/callchain.c
> +++ b/tools/perf/util/callchain.c
> @@ -1266,77 +1266,6 @@ int callchain_node__fprintf_value(struct callchain_node *node,
>  	return 0;
>  }
>  
> -static void callchain_counts_value(struct callchain_node *node,
> -				   u64 *branch_count, u64 *predicted_count,
> -				   u64 *abort_count, u64 *cycles_count)
> -{
> -	struct callchain_list *clist;
> -
> -	list_for_each_entry(clist, &node->val, list) {
> -		if (branch_count)
> -			*branch_count += clist->branch_count;
> -
> -		if (predicted_count)
> -			*predicted_count += clist->predicted_count;
> -
> -		if (abort_count)
> -			*abort_count += clist->abort_count;
> -
> -		if (cycles_count)
> -			*cycles_count += clist->cycles_count;
> -	}
> -}
> -
> -static int callchain_node_branch_counts_cumul(struct callchain_node *node,
> -					      u64 *branch_count,
> -					      u64 *predicted_count,
> -					      u64 *abort_count,
> -					      u64 *cycles_count)
> -{
> -	struct callchain_node *child;
> -	struct rb_node *n;
> -
> -	n = rb_first(&node->rb_root_in);
> -	while (n) {
> -		child = rb_entry(n, struct callchain_node, rb_node_in);
> -		n = rb_next(n);
> -
> -		callchain_node_branch_counts_cumul(child, branch_count,
> -						   predicted_count,
> -						   abort_count,
> -						   cycles_count);
> -
> -		callchain_counts_value(child, branch_count,
> -				       predicted_count, abort_count,
> -				       cycles_count);
> -	}
> -
> -	return 0;
> -}
> -
> -int callchain_branch_counts(struct callchain_root *root,
> -			    u64 *branch_count, u64 *predicted_count,
> -			    u64 *abort_count, u64 *cycles_count)
> -{
> -	if (branch_count)
> -		*branch_count = 0;
> -
> -	if (predicted_count)
> -		*predicted_count = 0;
> -
> -	if (abort_count)
> -		*abort_count = 0;
> -
> -	if (cycles_count)
> -		*cycles_count = 0;
> -
> -	return callchain_node_branch_counts_cumul(&root->node,
> -						  branch_count,
> -						  predicted_count,
> -						  abort_count,
> -						  cycles_count);
> -}
> -
>  static int count_pri64_printf(int idx, const char *str, u64 value, char *bf, int bfsize)
>  {
>  	return scnprintf(bf, bfsize, "%s%s:%" PRId64 "", (idx) ? " " : " (", str, value);
> diff --git a/tools/perf/util/callchain.h b/tools/perf/util/callchain.h
> index 86ed9e4d04f9..d7741fa9e9de 100644
> --- a/tools/perf/util/callchain.h
> +++ b/tools/perf/util/callchain.h
> @@ -298,10 +298,6 @@ void free_callchain(struct callchain_root *root);
>  void decay_callchain(struct callchain_root *root);
>  int callchain_node__make_parent_list(struct callchain_node *node);
>  
> -int callchain_branch_counts(struct callchain_root *root,
> -			    u64 *branch_count, u64 *predicted_count,
> -			    u64 *abort_count, u64 *cycles_count);
> -
>  void callchain_param_setup(u64 sample_type, const char *arch);
>  
>  bool callchain_cnode_matched(struct callchain_node *base_cnode,
> -- 
> 2.46.2
>