uprobes: turn trace_uprobe's nhit counter to be per-CPU one

trace_uprobe->nhit counter is not incremented atomically, so its value
is questionable in when uprobe is hit on multiple CPUs simultaneously.

Also, doing this shared counter increment across many CPUs causes heavy
cache line bouncing, limiting uprobe/uretprobe performance scaling with
number of CPUs.

Solve both problems by making this a per-CPU counter.

Link: https://lore.kernel.org/all/20240813203409.3985398-1-andrii@kernel.org/
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>

diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index c98e3b3386badb60a187e86e557ed4c26f76c966..c3df411a2684980a6a34c9b1fe49acd38c1b77f2 100644 (file)
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -17,6 +17,7 @@
 #include <linux/string.h>
 #include <linux/rculist.h>
 #include <linux/filter.h>
+#include <linux/percpu.h>
 
 #include "trace_dynevent.h"
 #include "trace_probe.h"
@@ -62,7 +63,7 @@ struct trace_uprobe {
        char                            *filename;
        unsigned long                   offset;
        unsigned long                   ref_ctr_offset;
-       unsigned long                   nhit;
+       unsigned long __percpu          *nhits;
        struct trace_probe              tp;
 };
 
@@ -337,6 +338,12 @@ alloc_trace_uprobe(const char *group, const char *event, int nargs, bool is_ret)
        if (!tu)
                return ERR_PTR(-ENOMEM);
 
+       tu->nhits = alloc_percpu(unsigned long);
+       if (!tu->nhits) {
+               ret = -ENOMEM;
+               goto error;
+       }
+
        ret = trace_probe_init(&tu->tp, event, group, true, nargs);
        if (ret < 0)
                goto error;
@@ -349,6 +356,7 @@ alloc_trace_uprobe(const char *group, const char *event, int nargs, bool is_ret)
        return tu;
 
 error:
+       free_percpu(tu->nhits);
        kfree(tu);
 
        return ERR_PTR(ret);
@@ -362,6 +370,7 @@ static void free_trace_uprobe(struct trace_uprobe *tu)
        path_put(&tu->path);
        trace_probe_cleanup(&tu->tp);
        kfree(tu->filename);
+       free_percpu(tu->nhits);
        kfree(tu);
 }
 
@@ -815,13 +824,21 @@ static int probes_profile_seq_show(struct seq_file *m, void *v)
 {
        struct dyn_event *ev = v;
        struct trace_uprobe *tu;
+       unsigned long nhits;
+       int cpu;
 
        if (!is_trace_uprobe(ev))
                return 0;
 
        tu = to_trace_uprobe(ev);
+
+       nhits = 0;
+       for_each_possible_cpu(cpu) {
+               nhits += per_cpu(*tu->nhits, cpu);
+       }
+
        seq_printf(m, "  %s %-44s %15lu\n", tu->filename,
-                       trace_probe_name(&tu->tp), tu->nhit);
+                  trace_probe_name(&tu->tp), nhits);
        return 0;
 }
 
@@ -1512,7 +1529,8 @@ static int uprobe_dispatcher(struct uprobe_consumer *con, struct pt_regs *regs)
        int ret = 0;
 
        tu = container_of(con, struct trace_uprobe, consumer);
-       tu->nhit++;
+
+       this_cpu_inc(*tu->nhits);
 
        udd.tu = tu;
        udd.bp_addr = instruction_pointer(regs);