]> git.baikalelectronics.ru Git - kernel.git/commit
bpf: avoid excessive stack usage for perf_sample_data
authorDaniel Borkmann <daniel@iogearbox.net>
Sat, 10 Jun 2017 22:50:40 +0000 (00:50 +0200)
committerDavid S. Miller <davem@davemloft.net>
Sat, 10 Jun 2017 23:05:45 +0000 (19:05 -0400)
commit7e622c548896ec25a53eedcc66c7ec5726ef33a7
tree8e5e133552c45aaf6eddf0e61c88939f2df57695
parentfc47420d24d03a3a87a1a707bfd607344d6d61e6
bpf: avoid excessive stack usage for perf_sample_data

perf_sample_data consumes 386 bytes on stack, reduce excessive stack
usage and move it to per cpu buffer. It's allowed due to preemption
being disabled for tracing, xdp and tc programs, thus at all times
only one program can run on a specific CPU and programs cannot run
from interrupt. We similarly also handle bpf_pt_regs.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
kernel/trace/bpf_trace.c