From: Daniel Borkmann <daniel@iogearbox.net>
To: Alexei Starovoitov <alexei.starovoitov@gmail.com>,
Ming Lei <tom.leiming@gmail.com>
Cc: linux-kernel@vger.kernel.org, Alexei Starovoitov <ast@kernel.org>,
"David S. Miller" <davem@davemloft.net>,
netdev@vger.kernel.org
Subject: Re: [PATCH 5/6] bpf: hash: avoid to call kmalloc() in eBPF prog
Date: Wed, 16 Dec 2015 00:42:47 +0100 [thread overview]
Message-ID: <5670A577.3010207@iogearbox.net> (raw)
In-Reply-To: <20151215231057.GB67370@ast-mbp.thefacebook.com>
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.
next prev parent reply other threads:[~2015-12-15 23:42 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-15 11:20 [PATCH 0/6] bpf: hash: optimization Ming Lei
2015-12-15 11:20 ` [PATCH 1/6] bpf: hash: use atomic count Ming Lei
2015-12-15 11:21 ` [PATCH 2/6] hlist: prepare for supporting bit spinlock Ming Lei
2015-12-15 11:21 ` [PATCH 3/6] bpf: hash: move select_bucket() out of htab's spinlock Ming Lei
2015-12-15 11:21 ` [PATCH 4/6] bpf: hash: convert per-hashtable lock into per-bucket bit spinlock Ming Lei
2015-12-15 22:51 ` Alexei Starovoitov
2015-12-16 2:57 ` Ming Lei
[not found] ` <CAHbLzkpW_seTrs+WgFqsriH5uhG4LMY_jiYC0iRQ-LAdJFiUjw@mail.gmail.com>
2015-12-16 6:58 ` Ming Lei
2015-12-18 6:20 ` Alexei Starovoitov
2015-12-26 8:58 ` Ming Lei
2015-12-15 11:21 ` [PATCH 5/6] bpf: hash: avoid to call kmalloc() in eBPF prog Ming Lei
2015-12-15 23:10 ` Alexei Starovoitov
2015-12-15 23:42 ` Daniel Borkmann [this message]
2015-12-16 7:13 ` Ming Lei
2015-12-15 23:21 ` Daniel Borkmann
2015-12-15 23:35 ` Daniel Borkmann
2015-12-16 0:12 ` Daniel Borkmann
2015-12-15 11:21 ` [PATCH 6/6] bpf: hash: reorganize 'struct htab_elem' Ming Lei
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