param1 and param2 are defined as formats for the PMU in:
/sys/bus/event_sources/devices/<pmu>/format/*
- - a hardware breakpoint event in the form of '\mem:addr[:access]'
+ - a hardware breakpoint event in the form of '\mem:addr[/len][:access]'
where addr is the address in memory you want to break in.
Access is the memory access type (read, write, execute) it can
- be passed as follows: '\mem:addr[:[r][w][x]]'.
+ be passed as follows: '\mem:addr[:[r][w][x]]'. len is the range,
+ number of bytes from specified addr, which the breakpoint will cover.
If you want to profile read-write accesses in 0x1000, just set
'mem:0x1000:rw'.
+ If you want to profile write accesses in [0x1000~1008), just set
+ 'mem:0x1000/8:w'.
--filter=<filter>::
Event filter.