libbpf-tools: initialize global variables in cachestat and funclatency

Signed-off-by: Hengqi Chen <[email protected]>
githubTang-T · Mar 17, 2021 · 6cf1b6f · 6cf1b6f
1 parent 9b6b05a
commit 6cf1b6f
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Showing 2 changed files with 6 additions and 6 deletions.
diff --git a/libbpf-tools/cachestat.bpf.c b/libbpf-tools/cachestat.bpf.c
@@ -4,9 +4,9 @@
 #include <bpf/bpf_helpers.h>
 #include <bpf/bpf_tracing.h>
 
-__s64 total; /* total cache accesses without counting dirties */
-__s64 misses; /* total of add to lru because of read misses */
-__u64 mbd; /* total of mark_buffer_dirty events */
+__s64 total = 0; /* total cache accesses without counting dirties */
+__s64 misses = 0; /* total of add to lru because of read misses */
+__u64 mbd = 0;  /* total of mark_buffer_dirty events */
 
 SEC("fentry/add_to_page_cache_lru")
 int BPF_PROG(add_to_page_cache_lru)

diff --git a/libbpf-tools/funclatency.bpf.c b/libbpf-tools/funclatency.bpf.c
@@ -7,8 +7,8 @@
 #include "funclatency.h"
 #include "bits.bpf.h"
 
-const volatile pid_t targ_tgid;
-const volatile int units;
+const volatile pid_t targ_tgid = 0;
+const volatile int units = 0;
 
 /* key: pid. value: start time */
 struct {
@@ -18,7 +18,7 @@ struct {
  __type(value, u64);
 } starts SEC(".maps");
 
-__u32 hist[MAX_SLOTS];
+__u32 hist[MAX_SLOTS] = {};
 
 SEC("kprobe/dummy_kprobe")
 int BPF_KPROBE(dummy_kprobe)