From: Peter Zijlstra <peterz@infradead.org>
To: Andrii Nakryiko <andrii.nakryiko@gmail.com>
Cc: Song Liu <songliubraving@fb.com>, bpf <bpf@vger.kernel.org>,
open list <linux-kernel@vger.kernel.org>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Ingo Molnar <mingo@redhat.com>, Kajol Jain <kjain@linux.ibm.com>,
Kernel Team <kernel-team@fb.com>
Subject: Re: [PATCH v5 bpf-next 2/3] bpf: introduce helper bpf_get_branch_snapshot
Date: Sat, 4 Sep 2021 12:24:30 +0200 [thread overview]
Message-ID: <20210904102430.GD4323@worktop.programming.kicks-ass.net> (raw)
In-Reply-To: <CAEf4BzZ0eq1iFh1oVwTZ7+bQkb=pJShgDWzUSAp41sk30iQunQ@mail.gmail.com>
On Fri, Sep 03, 2021 at 10:10:16AM -0700, Andrii Nakryiko wrote:
> > I suppose you have to have this helper function because the JIT cannot
> > emit static_call()... although in this case one could cheat and simply
> > emit a call to static_call_query() and not bother with dynamic updates
> > (because there aren't any).
>
> If that's safe, let's do it.
I'll try and remember to look into static_call_lock(), a means of
forever denying future static_call_update() calls. That should make this
more obvious.
next prev parent reply other threads:[~2021-09-04 10:25 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-02 16:57 [PATCH v5 bpf-next 0/3] bpf: introduce bpf_get_branch_snapshot Song Liu
2021-09-02 16:57 ` [PATCH v5 bpf-next 1/3] perf: enable branch record for software events Song Liu
2021-09-02 20:49 ` John Fastabend
2021-09-03 8:02 ` Peter Zijlstra
2021-09-03 16:50 ` Song Liu
2021-09-07 18:59 ` Song Liu
2021-09-07 20:50 ` Andrii Nakryiko
2021-09-03 8:27 ` Peter Zijlstra
2021-09-03 16:45 ` Song Liu
2021-09-04 10:18 ` Peter Zijlstra
2021-09-02 16:57 ` [PATCH v5 bpf-next 2/3] bpf: introduce helper bpf_get_branch_snapshot Song Liu
2021-09-02 20:56 ` John Fastabend
2021-09-02 22:04 ` Song Liu
2021-09-02 22:53 ` Andrii Nakryiko
2021-09-02 23:03 ` Song Liu
2021-09-02 23:05 ` Andrii Nakryiko
2021-09-03 1:03 ` Alexei Starovoitov
2021-09-03 8:28 ` Peter Zijlstra
2021-09-03 16:58 ` Song Liu
2021-09-03 8:47 ` Peter Zijlstra
2021-09-03 17:06 ` Song Liu
2021-09-03 17:10 ` Andrii Nakryiko
2021-09-04 10:24 ` Peter Zijlstra [this message]
2021-09-04 10:55 ` Peter Zijlstra
2021-09-02 16:57 ` [PATCH v5 bpf-next 3/3] selftests/bpf: add test for bpf_get_branch_snapshot Song Liu
2021-09-02 21:05 ` John Fastabend
2021-09-02 22:54 ` [PATCH v5 bpf-next 0/3] bpf: introduce bpf_get_branch_snapshot Andrii Nakryiko
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