Hi Dave, I am thankful to you for your immediate response. Since we know that symbols can be either structures, arrays, ordinary variables or functions, I want to fetch the values of only those symbols that are structures. Well when we execute sym -l command, we get the second field as symbol type as shown below. ffffffff80107000 (T) level3_physmem_pgt ffffffff80108000 (t) rest_init ..... ffffffff80333000 (D) cpu_gdt_table ffffffff80333080 (d) gdt_end ..... ffffffff802d93a0 (A) __stop___ex_table ffffffff802da000 (A) __start_rodata ffffffff802da000 (R) linux_banner ffffffff802da0c0 (r) p.13105 ffffffff802da100 (r) border I wanted to ensure whether we can use this information to identify whether a given symbol is a structure or a function or an ordinary variable.( can i assume that all symbols present in text segment are functions?) Also I wanted to know if there is any command wherein I can get a listing of all symbols that are related to memory, semaphores and tasks. Thanks, Ramya Dave Anderson <anderson(a)redhat.com&gt; wrote: ram ba wrote: Hi all,I was running crash to analyse a vmcore generated by a 2.6.16.21-0.8.uis.1-smp kernel ( on x86_64 architecture). During this I came to know that we get a list of all kernel symbols with the help of "sym -l" command. With the help of "whatis" command we can know the symbol definition.But applying "whatis" command to each symbol and checking its definition appears to be tedious. Is there any other way to identify as to which symbols represent structures? Also I wanted to isolate the structures related to memory, semaphores, tasks. Since I am new to crash utility, I couldn't get much information. Could you please provide some suggestions as to how to go about it.Thanks,Ramya --------------------------------- Need a quick answer? Get one in minutes from people who know. Ask your question on Yahoo! Answers. Ask "Yahoo! Answers"? ;-) Anyway, it's not clear to me what you're asking for? If a symbol-name is an instance of a data structure, or an array of data structures, you can simply enter: crash> p symbol-name If the symbol refers to an array of structures, you can pick an individual structure by its index: crash> p symbol-name[index] Or if the symbol is a pointer to a data strucutre, you display what it points to with: crash> p *symbol-name The above simply take advantage of the embedded gdb module pre-determining what the data type of a symbol is, and then printing it. When you ask that you want to "isolate the structures related to memory, semaphores, tasks", again, I don't understand what you are asking for. I'm probably missing your point, but, in any case, there's certainly no existing command that walks the symbol list and tells you what kind of data structure each one is -- if that's what you're expecting. Depending upon what you want, you could probably (1) cobble together an input script that you can in turn feed to crash, or (2) write an "extend" module that gathers the data that you specifically need. Dave -- Crash-utility mailing list Crash-utility(a)redhat.com https://www.redhat.com/mailman/listinfo/crash-utility __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

Hi Rachita, I am referring to the second column of sym -l command output. From sym -l command we get the information about symbol types.As you have specified the same information is present in system.map file as well. Since the output of command " nm <vmlinux file>" is placed in system.map file, I checked the man page of "nm" and got to know the symbol types. I came to know that types t,T (present in the second column of sym -l command) represent symbols that are located in text segment. Explanation about other data types are also given. I wanted to know whether only functions can reside in text segment or any other variables reside as well. If only functions reside in Text segment, it would be easy to identify the symbols that are functions. And I can easily segregate them from other symbols. So I thought this may help us to identify whether a given symbol name is function or not. I hope you can provide a better insight to this. As you and Dave had suggested I tried using gdb info command. But it is consuming lot of time. Including that in my script would slow down the entire code. It doesn't suit my need either. If you know any other method (need not be crash utility) to identify the symbol definitions, please let me know. Thanks, Ramya Rachita Kothiyal <rachita(a)in.ibm.com&gt; wrote: On Mon, Dec 11, 2006 at 08:19:32PM -0800, ram ba wrote: Hi Ramya I dont see how one could determine whether a symbol is a structure or not just by looking at the sym -l output. This is the same information one can get from the System.map file. Probably one way could be to query 'gdb' for each of these symbols for their symbol type, as Dave had mentioned. Thanks Rachita -- Crash-utility mailing list Crash-utility(a)redhat.com https://www.redhat.com/mailman/listinfo/crash-utility --------------------------------- Have a burning question? Go to Yahoo! Answers and get answers from real people who know.