1. 根目录:
2. tools
3. perf
4. util
5. environment.c

/*
 * We put all the perf config variables in this same object
 * file, so that programs can link against the config parser
 * without having to link against all the rest of perf.
 */
#include "cache.h"

const char *pager_program;
int pager_use_color = 1;