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Message-ID: <CAE40pdcCqu6zBqDgAXBpKHzX=y7hXtz83yEadYTE2yACiqyT3g@mail.gmail.com> Date: Thu, 14 Aug 2014 15:28:35 -0700 From: Brendan Gregg <brendan.d.gregg@...il.com> To: Alexei Starovoitov <ast@...mgrid.com> Cc: "David S. Miller" <davem@...emloft.net>, Ingo Molnar <mingo@...nel.org>, Linus Torvalds <torvalds@...ux-foundation.org>, Andy Lutomirski <luto@...capital.net>, Steven Rostedt <rostedt@...dmis.org>, Daniel Borkmann <dborkman@...hat.com>, Chema Gonzalez <chema@...gle.com>, Eric Dumazet <edumazet@...gle.com>, Peter Zijlstra <a.p.zijlstra@...llo.nl>, "H. Peter Anvin" <hpa@...or.com>, Andrew Morton <akpm@...ux-foundation.org>, Kees Cook <keescook@...omium.org>, linux-api@...r.kernel.org, netdev@...r.kernel.org, LKML <linux-kernel@...r.kernel.org> Subject: Re: [PATCH RFC v4 net-next 03/26] bpf: introduce syscall(BPF, ...) and BPF maps On Wed, Aug 13, 2014 at 12:57 AM, Alexei Starovoitov <ast@...mgrid.com> wrote: [...] > maps can have different types: hash, bloom filter, radix-tree, etc. > > The map is defined by: > . type > . max number of elements > . key size in bytes > . value size in bytes Can values be strings or byte arrays? How would user-level bpf read them? The two types of uses I'm thinking are: A. Constructing a custom string in kernel-context, and using that as the value. Eg, a truncated filename, or a dotted quad IP address, or the raw contents of a packet. B. I have a pointer to an existing buffer or string, eg a filename, that will likely be around for some time (>1s). Instead of the value storing the string, it could just be a ptr, so long as user-level bpf has a way to read it. Also, can keys be strings? I'd ask about multiple keys, but if they can be a string, I can delimit in the key (eg, "PID:filename"). Thanks, Brendan -- http://www.brendangregg.com -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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