linux-kernel - Re: [PATCH bpf] bpf: preallocate a perf_sample

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Message-ID: <20190608163933.50033e9f@oasis.local.home>
Date:   Sat, 8 Jun 2019 16:39:33 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Song Liu <songliubraving@...com>
Cc:     Matt Mullins <mmullins@...com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "daniel@...earbox.net" <daniel@...earbox.net>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        "ast@...nel.org" <ast@...nel.org>, Andrew Hall <hall@...com>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Martin Lau <kafai@...com>, Yonghong Song <yhs@...com>
Subject: Re: [PATCH bpf] bpf: preallocate a perf_sample_data per event fd

On Fri, 31 May 2019 05:26:30 +0000
Song Liu <songliubraving@...com> wrote:

> We can also do something like
> 
>    ee = kzalloc(sizeof(struct bpf_event_entry) + sizeof(struct perf_sample_data));
>    ee->sd = (void *)ee + sizeof(struct bpf_event_entry);

Or perhaps:

	ee->sd = (struct perf_sample_data *)(ee + 1);

-- Steve