kprobes: Add perf ksymbol events for kprobe insn pages (69e49088) · Commits · 戴 / test

include/uapi/linux/perf_event.h

+5 −0

Original line number	Diff line number	Diff line
		@@ -1049,6 +1049,11 @@ enum perf_event_type {
		enum perf_record_ksymbol_type {
		PERF_RECORD_KSYMBOL_TYPE_UNKNOWN = 0,
		PERF_RECORD_KSYMBOL_TYPE_BPF = 1,
		/*
		* Out of line code such as kprobe-replaced instructions or optimized
		* kprobes.
		*/
		PERF_RECORD_KSYMBOL_TYPE_OOL = 2,
		PERF_RECORD_KSYMBOL_TYPE_MAX /* non-ABI */
		};

+12 −0

Original line number	Diff line number	Diff line
		@@ -35,6 +35,7 @@
		#include <linux/ftrace.h>
		#include <linux/cpu.h>
		#include <linux/jump_label.h>
		#include <linux/perf_event.h>

		#include <asm/sections.h>
		#include <asm/cacheflush.h>
		@@ -184,6 +185,10 @@ kprobe_opcode_t __get_insn_slot(struct kprobe_insn_cache c)
		kip->cache = c;
		list_add_rcu(&kip->list, &c->pages);
		slot = kip->insns;

		/* Record the perf ksymbol register event after adding the page */
		perf_event_ksymbol(PERF_RECORD_KSYMBOL_TYPE_OOL, (unsigned long)kip->insns,
		PAGE_SIZE, false, c->sym);
		out:
		mutex_unlock(&c->mutex);
		return slot;
		@@ -202,6 +207,13 @@ static int collect_one_slot(struct kprobe_insn_page *kip, int idx)
		* next time somebody inserts a probe.
		*/
		if (!list_is_singular(&kip->list)) {
		/*
		* Record perf ksymbol unregister event before removing
		* the page.
		*/
		perf_event_ksymbol(PERF_RECORD_KSYMBOL_TYPE_OOL,
		(unsigned long)kip->insns, PAGE_SIZE, true,
		kip->cache->sym);
		list_del_rcu(&kip->list);
		synchronize_rcu();
		kip->cache->free(kip->insns);