/* Copyright (c) 2015 PLUMgrid, http://plumgrid.com
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 */
#include <linux/ptrace.h>
#include <linux/version.h>
#include <uapi/linux/bpf.h>
#include "bpf_helpers.h"

struct pair {
	u64 val;
	u64 ip;
};

struct bpf_map_def SEC("maps") my_map = {
	.type = BPF_MAP_TYPE_HASH,
	.key_size = sizeof(long),
	.value_size = sizeof(struct pair),
	.max_entries = 1000000,
};

/* kprobe is NOT a stable ABI. If kernel internals change this bpf+kprobe
 * example will no longer be meaningful
 */
SEC("kprobe/kmem_cache_free")
int bpf_prog1(struct pt_regs *ctx)
{
	long ptr = PT_REGS_PARM2(ctx);

	bpf_map_delete_elem(&my_map, &ptr);
	return 0;
}

SEC("kretprobe/kmem_cache_alloc_node")
int bpf_prog2(struct pt_regs *ctx)
{
	long ptr = PT_REGS_RC(ctx);
	long ip = 0;

	/* get ip address of kmem_cache_alloc_node() caller */
	BPF_KRETPROBE_READ_RET_IP(ip, ctx);

	struct pair v = {
		.val = bpf_ktime_get_ns(),
		.ip = ip,
	};

	bpf_map_update_elem(&my_map, &ptr, &v, BPF_ANY);
	return 0;
}
char _license[] SEC("license") = "GPL";
u32 _version SEC("version") = LINUX_VERSION_CODE;
p-back</option>
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<tr><td class='sub'>net-next plumbings</td><td class='sub right'>Tobias Klauser</td></tr></table>
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/log/?h=nds-private-remove&amp;id=cda8bba0f99d25d2061c531113c14fa41effc3ae'>root</a>/<a href='/cgit.cgi/linux/net-next.git/log/include?h=nds-private-remove&amp;id=cda8bba0f99d25d2061c531113c14fa41effc3ae'>include</a>/<a href='/cgit.cgi/linux/net-next.git/log/include/dt-bindings?h=nds-private-remove&amp;id=cda8bba0f99d25d2061c531113c14fa41effc3ae'>dt-bindings</a>/<a href='/cgit.cgi/linux/net-next.git/log/include/dt-bindings/clock?h=nds-private-remove&amp;id=cda8bba0f99d25d2061c531113c14fa41effc3ae'>clock</a>/<a href='/cgit.cgi/linux/net-next.git/log/include/dt-bindings/clock/hi3519-clock.h?h=nds-private-remove&amp;id=cda8bba0f99d25d2061c531113c14fa41effc3ae'>hi3519-clock.h</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/cgit.cgi/linux/net-next.git/log/include/dt-bindings/clock/hi3519-clock.h?h=nds-private-remove&amp;id=cda8bba0f99d25d2061c531113c14fa41effc3ae&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>