netdev - Re: [PATCH bpf-next v4 1/2] bpf: extend stackmap to save binary_build

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Message-ID: <664505EF-F681-4641-B49A-6CF4F5CFB5C8@fb.com>
Date:   Mon, 12 Mar 2018 21:12:28 +0000
From:   Song Liu <songliubraving@...com>
To:     Alexei Starovoitov <ast@...com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "ast@...nel.org" <ast@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Kernel Team <Kernel-team@...com>,
        "hannes@...xchg.org" <hannes@...xchg.org>,
        Teng Qin <qinteng@...com>
Subject: Re: [PATCH bpf-next v4 1/2] bpf: extend stackmap to save
 binary_build_id+offset instead of address


> On Mar 12, 2018, at 2:00 PM, Alexei Starovoitov <ast@...com> wrote:
> 
> On 3/12/18 1:39 PM, Song Liu wrote:
>> +	page = find_get_page(vma->vm_file->f_mapping, 0);
> 
> did you test it with config_debug_atomic_sleep ?
> it should have complained...

Yeah, I have CONFIG_DEBUG_ATOMIC_SLEEP=y. 

I think find_get_page() will not sleep. The variation find_get_page_flags()
may sleep with flag FGP_CREAT. 

Song