Merge pull request #1031 from hodgesds/dump-common-header

scx: Add scx_bpf_dump_header helper

scheds/include/scx/common.bpf.h

@@ -23,6 +23,9 @@
 #define PF_KTHREAD 0x00200000   /* I am a kernel thread */
 #define PF_EXITING 0x00000004
 #define CLOCK_MONOTONIC 1
+extern int LINUX_KERNEL_VERSION __kconfig;
+extern const char CONFIG_CC_VERSION_TEXT[64] __kconfig __weak;
+extern const char CONFIG_LOCALVERSION[64] __kconfig __weak;
 
 /*
  * Earlier versions of clang/pahole lost upper 32bits in 64bit enums which can
@@ -150,6 +153,20 @@ ___scx_bpf_bstr_format_checker(const char *fmt, ...) {}
     ___scx_bpf_bstr_format_checker(fmt, ##args);                               \
   })
 
+/*
+ * scx_bpf_dump_header() is a wrapper around scx_bpf_dump that adds a header
+ * of system information for debugging.
+ */
+#define scx_bpf_dump_header()							\
+  ({										\
+    scx_bpf_dump("kernel: %d.%d.%d %s\ncc: %s\n",				\
+		 LINUX_KERNEL_VERSION >> 16,					\
+		 LINUX_KERNEL_VERSION >> 8 & 0xFF,				\
+		 LINUX_KERNEL_VERSION & 0xFF,					\
+		 CONFIG_LOCALVERSION,						\
+		 CONFIG_CC_VERSION_TEXT);					\
+  })
+
 #define BPF_STRUCT_OPS(name, args...)                                          \
   SEC("struct_ops/" #name)                                                     \
   BPF_PROG(name, ##args)

scheds/rust/scx_layered/src/bpf/main.bpf.c

@@ -2198,6 +2198,8 @@ void BPF_STRUCT_OPS(layered_dump, struct scx_dump_ctx *dctx)
 	int i, j, id;
 	struct layer *layer;
 
+	scx_bpf_dump_header();
+
 	bpf_for(i, 0, nr_layers) {
 		layer = lookup_layer(i);
 		if (!layer) {