Re: [Crash-utility] Faster iteration on list of struct.field

----- Original Message ----- > Hi, > > I often find myself dumping a bunch of addresses to files to iterate > with 'struct_name.field < file_with_addresses', but that is horribly > slow for large number of iterations. > > `help list` comment for -S vs. -s made me try to use `rd` instead, > e.g. get offset manually from `struct -o` then use rd instead like > `rd -o xx < addr_list | awk '{ print $2 }' > value_list` -- and that is > infinitely better. > > > Would it make sense to add a similar option to 'struct' instead so one > could do e.g. `struct -S struct_name.field addr` instead of the dance I was > doing? > (That would require to cache field offset in crash and not query it > again everytime, from a quick look at the code, but we could only cache > one and still gain a lot for such iterations...) > > > Am I missing another more practical way of doing this? > (I guess it's not so bad now I came up with using 'rd', but that was > non-obvious to me. My use case here involved following a couple of > pointers from a list so I dumped the first pointer to follow from list > with -S struct1.field1, but then the following iteration just wouldn't > end naively) Dominique, What might make sense is to use the "struct -r" option, which does a raw memory dump of a data structure. But for a reason I do not recall, it prevents that option from being used with a "struct_name.field" argument. (see line 6628 of symbols.c). But I don't see why that couldn't be made to work, though, since the end result is simply a call to raw_data_dump(). Dave