From: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
To: ast@kernel.org, daniel@iogearbox.net
Cc: bpf@vger.kernel.org, netdev@vger.kernel.org,
bjorn.topel@intel.com, magnus.karlsson@intel.com,
Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Subject: [PATCH bpf-next 0/2] bpf, x64: optimize JIT's pro/epilogue
Date: Tue, 29 Sep 2020 22:46:51 +0200 [thread overview]
Message-ID: <20200929204653.4325-1-maciej.fijalkowski@intel.com> (raw)
Hi!
This small set can be considered as a followup after recent addition of
support for tailcalls in bpf subprograms and is focused on optimizing
x64 JIT prologue and epilogue sections.
Turns out the popping tail call counter is not needed anymore and %rsp
handling when stack depth is 0 can be skipped.
For longer explanations, please see commit messages.
Thank you,
Maciej
Maciej Fijalkowski (2):
bpf, x64: drop "pop %rcx" instruction on BPF JIT epilogue
bpf: x64: do not emit sub/add 0, %rsp when !stack_depth
arch/x86/net/bpf_jit_comp.c | 35 +++++++++++++++++++++++------------
1 file changed, 23 insertions(+), 12 deletions(-)
--
2.20.1
next reply other threads:[~2020-09-29 20:53 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-29 20:46 Maciej Fijalkowski [this message]
2020-09-29 20:46 ` [PATCH bpf-next 1/2] bpf, x64: drop "pop %rcx" instruction on BPF JIT epilogue Maciej Fijalkowski
2020-09-29 20:46 ` [PATCH bpf-next 2/2] bpf: x64: do not emit sub/add 0, %rsp when !stack_depth Maciej Fijalkowski
2020-09-30 0:00 ` [PATCH bpf-next 0/2] bpf, x64: optimize JIT's pro/epilogue patchwork-bot+bpf
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