1 files changed, 46 insertions, 1 deletions

diff --git a/tools/testing/selftests/bpf/uprobe_multi.c b/tools/testing/selftests/bpf/uprobe_multi.c
index a61ceab60b68..dd38dc68f635 100644
--- a/tools/testing/selftests/bpf/uprobe_multi.c
+++ b/tools/testing/selftests/bpf/uprobe_multi.c
@@ -2,14 +2,31 @@
 
 #include <stdio.h>
 #include <string.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <sys/mman.h>
+#include <unistd.h>
 #include <sdt.h>
 
+#ifndef MADV_POPULATE_READ
+#define MADV_POPULATE_READ 22
+#endif
+
+#ifndef MADV_PAGEOUT
+#define MADV_PAGEOUT 21
+#endif
+
+int __attribute__((weak)) uprobe(void)
+{
+	return 0;
+}
+
 #define __PASTE(a, b) a##b
 #define PASTE(a, b) __PASTE(a, b)
 
 #define NAME(name, idx) PASTE(name, idx)
 
-#define DEF(name, idx)  int NAME(name, idx)(void) { return 0; }
+#define DEF(name, idx) int __attribute__((weak)) NAME(name, idx)(void) { return 0; }
 #define CALL(name, idx) NAME(name, idx)();
 
 #define F(body, name, idx) body(name, idx)
@@ -75,6 +92,30 @@ static int usdt(void)
 	return 0;
 }
 
+extern char build_id_start[];
+extern char build_id_end[];
+
+int __attribute__((weak)) trigger_uprobe(bool build_id_resident)
+{
+	int page_sz = sysconf(_SC_PAGESIZE);
+	void *addr;
+
+	/* page-align build ID start */
+	addr = (void *)((uintptr_t)&build_id_start & ~(page_sz - 1));
+
+	/* to guarantee MADV_PAGEOUT work reliably, we need to ensure that
+	 * memory range is mapped into current process, so we unconditionally
+	 * do MADV_POPULATE_READ, and then MADV_PAGEOUT, if necessary
+	 */
+	madvise(addr, page_sz, MADV_POPULATE_READ);
+	if (!build_id_resident)
+		madvise(addr, page_sz, MADV_PAGEOUT);
+
+	(void)uprobe();
+
+	return 0;
+}
+
 int main(int argc, char **argv)
 {
 	if (argc != 2)
@@ -84,6 +125,10 @@ int main(int argc, char **argv)
 		return bench();
 	if (!strcmp("usdt", argv[1]))
 		return usdt();
+	if (!strcmp("uprobe-paged-out", argv[1]))
+		return trigger_uprobe(false /* page-out build ID */);
+	if (!strcmp("uprobe-paged-in", argv[1]))
+		return trigger_uprobe(true /* page-in build ID */);
 
 error:
 	fprintf(stderr, "usage: %s <bench|usdt>\n", argv[0]);