From: Daniel Borkmann <daniel-FeC+5ew28dpmcu3hnIyYJQ@public.gmane.org>
To: Alexei Starovoitov <ast-uqk4Ao+rVK5Wk0Htik3J/w@public.gmane.org>
Cc: mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
linux-man-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH man] ebpf.2: various updates to address some fixmes
Date: Tue, 28 Jul 2015 19:35:42 +0200 [thread overview]
Message-ID: <55B7BD6E.4080205@iogearbox.net> (raw)
In-Reply-To: <55B7BB08.9070608-uqk4Ao+rVK5Wk0Htik3J/w@public.gmane.org>
On 07/28/2015 07:25 PM, Alexei Starovoitov wrote:
> On 7/28/15 8:29 AM, Daniel Borkmann wrote:
>> +.BR __sync_fetch_and_add()
>> +can be used on map values in case the map has a value_size of sizeof(long).
>> +This is quite often useful for aggregation and accounting of events.
>
> The above is a bit not clear, since both u32 and u64 can be used
> as atomic counters.
Right, it's unclear indeed. Perhaps the sizeof(long) should be dropped and
it should say instead "the map has a value_size of 4 or 8 bytes".
Thanks,
Daniel
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next prev parent reply other threads:[~2015-07-28 17:35 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-28 15:29 [PATCH man] ebpf.2: various updates to address some fixmes Daniel Borkmann
[not found] ` <a8aa1bd1ddb4cd90a26887f2ce68d79c1e1e4c1f.1438097188.git.daniel-FeC+5ew28dpmcu3hnIyYJQ@public.gmane.org>
2015-07-28 17:25 ` Alexei Starovoitov
[not found] ` <55B7BB08.9070608-uqk4Ao+rVK5Wk0Htik3J/w@public.gmane.org>
2015-07-28 17:35 ` Daniel Borkmann [this message]
[not found] ` <55B7BD6E.4080205-FeC+5ew28dpmcu3hnIyYJQ@public.gmane.org>
2015-07-28 18:01 ` Alexei Starovoitov
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