lkml.org 
[lkml]   [2019]   [Mar]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [PATCH v9 perf,bpf 09/15] perf, bpf: save btf information as headers to perf.data
Em Tue, Mar 12, 2019 at 12:14:05PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Mon, Mar 11, 2019 at 10:30:45PM -0700, Song Liu escreveu:
> > +static void print_bpf_btf(struct feat_fd *ff, FILE *fp)
> > +{
> > + struct perf_env *env = &ff->ph->env;
> > + struct rb_root *root;
> > + struct rb_node *next;
> > +
> > + down_read(&env->bpf_progs.lock);
> > +
> > + 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);
> > + fprintf(fp, "# btf info of id %u\n", node->id);
>
> So, I couldn't get this to work right now, and I have BPF programs that
> are loaded and that have BTF info:
>
> [root@quaco ~]# bpftool prog | tail -6
> 208: tracepoint name sys_enter tag 819967866022f1e1 gpl
> loaded_at 2019-03-12T11:16:55-0300 uid 0
> xlated 528B jited 381B memlock 4096B map_ids 107,106,105
> 209: tracepoint name sys_exit tag c1bd85c092d6e4aa gpl
> loaded_at 2019-03-12T11:16:55-0300 uid 0
> xlated 256B jited 191B memlock 4096B map_ids 107,106
> [root@quaco ~]#
>
>
> [root@quaco ~]# bpftool map | tail -6
> 105: perf_event_array name __augmented_sys flags 0x0
> key 4B value 4B max_entries 8 memlock 4096B
> 106: array name syscalls flags 0x0
> key 4B value 1B max_entries 512 memlock 8192B
> 107: hash name pids_filtered flags 0x0
> key 4B value 1B max_entries 64 memlock 8192B
> [root@quaco ~]#
>
> [root@quaco ~]# bpftool map dump id 107
> [{
> "key": 8104,
> "value": true
> },{
> "key": 18868,
> "value": true
> }
> ]
> [root@quaco ~]# ps ax|egrep 8104\|18868 | grep -v grep
> 8104 pts/8 S+ 0:07 trace -e recvmmsg
> 18868 ? Ssl 21:21 /usr/libexec/gnome-terminal-server
> [root@quaco ~]#
>
> So I was expecting to see those btf lines there :-\
>
> All the patches up to this point I have already merged and tested in my
> local branch.
>
> Will continue right after lunch to try to figure out why this BTF info
> isn't landing on this new header feature...

I've pushed what I have to my git.kernel.org repo, branch
tmp.perf/bpf-annotate.

git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git tmp.perf/bpf-annotate

The HEAD is this cset.

- Arnaldo

\
 
 \ /
  Last update: 2019-03-12 16:16    [W:0.111 / U:5.584 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site