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authorDaniel Borkmann <daniel@iogearbox.net>2018-03-07 22:10:01 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-03-28 18:40:17 +0200
commitb3ca20cba49a9cc656f70b6ffbea4b5098f90aa2 (patch)
treecb0770a0767b8eac7dc81b5530945887812c5e12
parentc9ea2f8af67399904fe9c72ab5192a0c0ae7f2bf (diff)
bpf, x64: increase number of passes
commit 6007b080d2e2adb7af22bf29165f0594ea12b34c upstream. In Cilium some of the main programs we run today are hitting 9 passes on x64's JIT compiler, and we've had cases already where we surpassed the limit where the JIT then punts the program to the interpreter instead, leading to insertion failures due to CONFIG_BPF_JIT_ALWAYS_ON or insertion failures due to the prog array owner being JITed but the program to insert not (both must have the same JITed/non-JITed property). One concrete case the program image shrunk from 12,767 bytes down to 10,288 bytes where the image converged after 16 steps. I've measured that this took 340us in the JIT until it converges on my i7-6600U. Thus, increase the original limit we had from day one where the JIT covered cBPF only back then before we run into the case (as similar with the complexity limit) where we trip over this and hit program rejections. Also add a cond_resched() into the compilation loop, the JIT process runs without any locks and may sleep anyway. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org> Reviewed-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--arch/x86/net/bpf_jit_comp.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c
index a889211e21c5..dd9a861fd526 100644
--- a/arch/x86/net/bpf_jit_comp.c
+++ b/arch/x86/net/bpf_jit_comp.c
@@ -1077,7 +1077,7 @@ void bpf_int_jit_compile(struct bpf_prog *prog)
* may converge on the last pass. In such case do one more
* pass to emit the final image
*/
- for (pass = 0; pass < 10 || image; pass++) {
+ for (pass = 0; pass < 20 || image; pass++) {
proglen = do_jit(prog, addrs, image, oldproglen, &ctx);
if (proglen <= 0) {
image = NULL;
@@ -1100,6 +1100,7 @@ void bpf_int_jit_compile(struct bpf_prog *prog)
goto out;
}
oldproglen = proglen;
+ cond_resched();
}
if (bpf_jit_enable > 1)