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When processing the perf data file generated with multiple events, the flamegraph script will count all the events regardless of different event names. This patch tries to add a -e option to specify the event name that the flamegraph will be generated accordingly. If the -e option omitted, the behavior remains unchanged. Signed-off-by: Tianyou Li <tianyou.li@intel.com> Reviewed-by: Pan Deng <pan.deng@intel.com> Reviewed-by: Zhiguo Zhou <zhiguo.zhou@intel.com> Reviewed-by: Wangyang Guo <wangyang.guo@intel.com> Reviewed-by: Tim Chen <tim.c.chen@linux.intel.com> Link: https://lore.kernel.org/r/20250610040536.2390060-2-tianyou.li@intel.com Signed-off-by: Namhyung Kim <namhyung@kernel.org>