From e09b41010ba33a20a87472ee821fa407a5b8da36 Mon Sep 17 00:00:00 2001 From: José Pekkarinen Date: Mon, 11 Apr 2016 10:41:07 +0300 Subject: These changes are the raw update to linux-4.4.6-rt14. Kernel sources are taken from kernel.org, and rt patch from the rt wiki download page. MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit During the rebasing, the following patch collided: Force tick interrupt and get rid of softirq magic(I70131fb85). Collisions have been removed because its logic was found on the source already. Change-Id: I7f57a4081d9deaa0d9ccfc41a6c8daccdee3b769 Signed-off-by: José Pekkarinen --- kernel/samples/bpf/tracex2_kern.c | 30 ++++++++++++++++++++++-------- 1 file changed, 22 insertions(+), 8 deletions(-) (limited to 'kernel/samples/bpf/tracex2_kern.c') diff --git a/kernel/samples/bpf/tracex2_kern.c b/kernel/samples/bpf/tracex2_kern.c index 19ec1cfc4..b32367cfb 100644 --- a/kernel/samples/bpf/tracex2_kern.c +++ b/kernel/samples/bpf/tracex2_kern.c @@ -27,10 +27,10 @@ int bpf_prog2(struct pt_regs *ctx) long init_val = 1; long *value; - /* x64 specific: read ip of kfree_skb caller. + /* x64/s390x specific: read ip of kfree_skb caller. * non-portable version of __builtin_return_address(0) */ - bpf_probe_read(&loc, sizeof(loc), (void *)ctx->sp); + bpf_probe_read(&loc, sizeof(loc), (void *)PT_REGS_RET(ctx)); value = bpf_map_lookup_elem(&my_map, &loc); if (value) @@ -62,24 +62,38 @@ static unsigned int log2l(unsigned long v) return log2(v); } +struct hist_key { + char comm[16]; + u64 pid_tgid; + u64 uid_gid; + u32 index; +}; + struct bpf_map_def SEC("maps") my_hist_map = { - .type = BPF_MAP_TYPE_ARRAY, - .key_size = sizeof(u32), + .type = BPF_MAP_TYPE_HASH, + .key_size = sizeof(struct hist_key), .value_size = sizeof(long), - .max_entries = 64, + .max_entries = 1024, }; SEC("kprobe/sys_write") int bpf_prog3(struct pt_regs *ctx) { - long write_size = ctx->dx; /* arg3 */ + long write_size = PT_REGS_PARM3(ctx); long init_val = 1; long *value; - u32 index = log2l(write_size); + struct hist_key key = {}; + + key.index = log2l(write_size); + key.pid_tgid = bpf_get_current_pid_tgid(); + key.uid_gid = bpf_get_current_uid_gid(); + bpf_get_current_comm(&key.comm, sizeof(key.comm)); - value = bpf_map_lookup_elem(&my_hist_map, &index); + value = bpf_map_lookup_elem(&my_hist_map, &key); if (value) __sync_fetch_and_add(value, 1); + else + bpf_map_update_elem(&my_hist_map, &key, &init_val, BPF_ANY); return 0; } char _license[] SEC("license") = "GPL"; -- cgit 1.2.3-korg