Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1292649

Re: [PATCH 5/6] bpf: hash: avoid to call kmalloc() in eBPF prog

Show all headers | View raw

On 12/16/2015 12:10 AM, Alexei Starovoitov wrote:
...
> this rounding to cache line is great for performance, but it's extra
> memory upfront which may not be needed. The per-allocation is a classic
> performance vs memory trade-off. In other cases it may hurt.
> So could you change the patch to do pre-allocation only when
> requested by user space via extra flag for hash map or via
> new BPF_MAP_TYPE_HASH_PREALLOC type? Not sure yet whether flag or
> new type is better. I guess implementation will dictate.

Was also thinking about this, probably new map type makes sense.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

[PATCH 0/6] bpf: hash: optimization Ming Lei <tom.leiming@gmail.com> - 2015-12-15 12:30 +0100
  [PATCH 6/6] bpf: hash: reorganize 'struct htab_elem' Ming Lei <tom.leiming@gmail.com> - 2015-12-15 12:30 +0100
  [PATCH 5/6] bpf: hash: avoid to call kmalloc() in eBPF prog Ming Lei <tom.leiming@gmail.com> - 2015-12-15 12:30 +0100
    Re: [PATCH 5/6] bpf: hash: avoid to call kmalloc() in eBPF prog Alexei Starovoitov <alexei.starovoitov@gmail.com> - 2015-12-16 00:20 +0100
      Re: [PATCH 5/6] bpf: hash: avoid to call kmalloc() in eBPF prog Daniel Borkmann <daniel@iogearbox.net> - 2015-12-16 00:50 +0100
      Re: [PATCH 5/6] bpf: hash: avoid to call kmalloc() in eBPF prog Ming Lei <tom.leiming@gmail.com> - 2015-12-16 08:20 +0100
    Re: [PATCH 5/6] bpf: hash: avoid to call kmalloc() in eBPF prog Daniel Borkmann <daniel@iogearbox.net> - 2015-12-16 00:30 +0100
    Re: [PATCH 5/6] bpf: hash: avoid to call kmalloc() in eBPF prog Daniel Borkmann <daniel@iogearbox.net> - 2015-12-16 00:40 +0100
      Re: [PATCH 5/6] bpf: hash: avoid to call kmalloc() in eBPF prog Daniel Borkmann <daniel@iogearbox.net> - 2015-12-16 01:20 +0100
  [PATCH 2/6] hlist: prepare for supporting bit spinlock Ming Lei <tom.leiming@gmail.com> - 2015-12-15 12:30 +0100
  [PATCH 1/6] bpf: hash: use atomic count Ming Lei <tom.leiming@gmail.com> - 2015-12-15 12:30 +0100
  [PATCH 3/6] bpf: hash: move select_bucket() out of htab's spinlock Ming Lei <tom.leiming@gmail.com> - 2015-12-15 12:30 +0100

csiph-web