linux-kernel - Re: [PATCH v6 perf,bpf 08/15] perf, bpf: save btf in a rbtree in perf

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Message-ID: <20190307140540.GB7233@krava>
Date:   Thu, 7 Mar 2019 15:05:40 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Song Liu <songliubraving@...com>
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, ast@...nel.org, daniel@...earbox.net,
        kernel-team@...com, peterz@...radead.org, acme@...hat.com,
        jolsa@...nel.org, namhyung@...nel.org
Subject: Re: [PATCH v6 perf,bpf 08/15] perf, bpf: save btf in a rbtree in
 perf_env

On Tue, Mar 05, 2019 at 11:13:52PM -0800, Song Liu wrote:

SNIP

>  /* purge data in bpf_progs.infos tree */
>  static void perf_env__purge_bpf(struct perf_env *env)
>  {
> @@ -82,6 +133,19 @@ static void perf_env__purge_bpf(struct perf_env *env)
>  		rb_erase_init(&node->rb_node, root);
>  		free(node);
>  	}
> +
> +	root = &env->bpf_progs.btfs;
> +	next = rb_first(root);
> +
> +	while (next) {
> +		struct btf_node *node;
> +
> +		node = rb_entry(next, struct btf_node, rb_node);
> +		next = rb_next(&node->rb_node);
> +		rb_erase_init(&node->rb_node, root);

hum rb_erase should be enough when we are removingfreeing the node right
after.. also for the struct bpf_prog_info_node up

jirka

> +		free(node);
> +	}

SNIP