From: Oleg Nesterov <oleg@redhat.com>
To: Jiri Olsa <olsajiri@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>,
bpf@vger.kernel.org, Martin KaFai Lau <kafai@fb.com>,
Song Liu <songliubraving@fb.com>, Yonghong Song <yhs@fb.com>,
John Fastabend <john.fastabend@gmail.com>,
KP Singh <kpsingh@chromium.org>,
Stanislav Fomichev <sdf@fomichev.me>, Hao Luo <haoluo@google.com>,
Steven Rostedt <rostedt@goodmis.org>,
Masami Hiramatsu <mhiramat@kernel.org>,
linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org
Subject: Re: [PATCHv4 02/14] uprobe: Add support for session consumer
Date: Mon, 23 Sep 2024 12:05:53 +0200 [thread overview]
Message-ID: <20240923100552.GA20793@redhat.com> (raw)
In-Reply-To: <ZvEhL114tyhLmfB1@krava>
On 09/23, Jiri Olsa wrote:
>
> change below should do what you proposed originally
LGTM, just one nit below.
But I guess you need to do this on top of bpf/bpf.git, Andrii has already
applied your series.
And to remind, 02/14 must be fixed in any case unless I am totally confused,
handler_chain() can leak return_instance.
> also on top of that.. I discussed with Andrii the possibility of dropping
> the UPROBE_HANDLER_IWANTMYCOOKIE completely and setup cookie for any consumer
> that has both 'handler' and 'ret_handler' defined, wdyt?
Up to you. As I said from the very beginning I won't insist on _IWANTMYCOOKIE.
> list_for_each_entry_srcu(uc, &uprobe->consumers, cons_node,
> srcu_read_lock_held(&uprobes_srcu)) {
> + ric = return_consumer_find(ri, &ric_idx, uc->id);
> if (uc->ret_handler)
> - uc->ret_handler(uc, ri->func, regs);
> + uc->ret_handler(uc, ri->func, regs, ric ? &ric->cookie : NULL);
> }
> srcu_read_unlock(&uprobes_srcu, srcu_idx);
return_consumer_find() makes no sense if !uc->ret_handler, can you move
ric = return_consumer_find(ri, &ric_idx, uc->id);
into the "if (uc->ret_handler)" block?
Oleg.
next prev parent reply other threads:[~2024-09-23 10:06 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-09-17 8:50 [PATCHv4 00/14] uprobe, bpf: Add session support Jiri Olsa
2024-09-17 8:50 ` [PATCHv4 01/14] uprobe: Add data pointer to consumer handlers Jiri Olsa
2024-09-17 8:50 ` [PATCHv4 02/14] uprobe: Add support for session consumer Jiri Olsa
2024-09-17 12:03 ` Oleg Nesterov
2024-09-17 12:51 ` Jiri Olsa
2024-09-22 15:27 ` Oleg Nesterov
2024-09-23 8:05 ` Jiri Olsa
2024-09-23 10:05 ` Oleg Nesterov [this message]
2024-09-23 11:02 ` Jiri Olsa
2024-09-23 12:13 ` Oleg Nesterov
2024-09-17 12:22 ` Oleg Nesterov
2024-09-17 8:50 ` [PATCHv4 03/14] bpf: Add support for uprobe multi session attach Jiri Olsa
2024-09-17 8:50 ` [PATCHv4 04/14] bpf: Add support for uprobe multi session context Jiri Olsa
2024-09-17 8:50 ` [PATCHv4 05/14] bpf: Allow return values 0 and 1 for uprobe/kprobe session Jiri Olsa
2024-09-17 8:50 ` [PATCHv4 06/14] libbpf: Fix uretprobe.multi.s programs auto attachment Jiri Olsa
2024-09-17 8:50 ` [PATCHv4 07/14] libbpf: Add support for uprobe multi session attach Jiri Olsa
2024-09-17 8:50 ` [PATCHv4 08/14] selftests/bpf: Add uprobe session test Jiri Olsa
2024-09-17 8:50 ` [PATCHv4 09/14] selftests/bpf: Add uprobe session cookie test Jiri Olsa
2024-09-17 8:50 ` [PATCHv4 10/14] selftests/bpf: Add uprobe session recursive test Jiri Olsa
2024-09-17 8:50 ` [PATCHv4 11/14] selftests/bpf: Add uprobe session verifier test for return value Jiri Olsa
2024-09-17 8:50 ` [PATCHv4 12/14] selftests/bpf: Add kprobe " Jiri Olsa
2024-09-17 8:50 ` [PATCHv4 13/14] selftests/bpf: Add uprobe session single consumer test Jiri Olsa
2024-09-17 8:50 ` [PATCHv4 14/14] selftests/bpf: Add consumers stress test on single uprobe Jiri Olsa
2024-09-23 8:34 ` [PATCHv4 00/14] uprobe, bpf: Add session support patchwork-bot+netdevbpf
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