I have a pre-compiled .so library, which was given to me for profiling.
gdb can see a complete call stack -- both the library and my own code, as
expected.
But in perf the callgraph for the library is not present. I'm using "perf
record -g", and the callgraph for the other code is seen.
In what cases could gdb see the stack, but perf cannot?
Many thanks
--
Mark
---
# System is Scientific Linux 6.3 (derived from RedHat 6.3)
$ uname -a
Linux star 2.6.32-358.el6.x86_64 #1 SMP Fri Feb 22 20:37:17 CST 2013 x86_64
x86_64 x86_64 GNU/Linux
$ rpm -q perf
perf-2.6.32-358.el6.x86_64
$ rpm -q gdb
gdb-7.2-56.el6.x86_64
# The library which is missing the callgraph is librj.so
$ perf script -L
[...]
radford. 16009 1117798.447638: cycles:
7ff2836dd906 RjMetaDataGetStr (/mnt/scratch/radford/librj.so)
radford. 16009 1117798.471449: cycles:
7ff2837213a2 RjFile::getChar() (/mnt/scratch/radford/librj.so)
radford. 16102 1117798.707682: cycles:
ffffffffa0fa9281 rpc_task_release_client
(/lib/modules/2.6.32-358.el6.x86_64/kernel/net/sunrpc/sunrpc.ko)
ffffffffa0fb1f7b rpc_release_resources_task
(/lib/modules/2.6.32-358.el6.x86_64/kernel/net/sunrpc/sunrpc.ko)
ffffffffa0fb2a84 __rpc_execute
(/lib/modules/2.6.32-358.el6.x86_64/kernel/net/sunrpc/sunrpc.ko)
ffffffffa0fb2cc1 rpc_execute
(/lib/modules/2.6.32-358.el6.x86_64/kernel/net/sunrpc/sunrpc.ko)
ffffffffa0fa93a5 rpc_run_task
(/lib/modules/2.6.32-358.el6.x86_64/kernel/net/sunrpc/sunrpc.ko)
ffffffffa0fa94c2 rpc_call_sync
(/lib/modules/2.6.32-358.el6.x86_64/kernel/net/sunrpc/sunrpc.ko)
ffffffffa106af6d nfs3_rpc_wrapper.clone.0
(/lib/modules/2.6.32-358.el6.x86_64/kernel/fs/nfs/nfs.ko)
ffffffffa106b34c nfs3_proc_access
(/lib/modules/2.6.32-358.el6.x86_64/kernel/fs/nfs/nfs.ko)
ffffffffa10531e9 nfs_do_access
(/lib/modules/2.6.32-358.el6.x86_64/kernel/fs/nfs/nfs.ko)
ffffffffa10534b8 nfs_permission
(/lib/modules/2.6.32-358.el6.x86_64/kernel/fs/nfs/nfs.ko)
ffffffff8119053d __link_path_walk ([kernel.kallsyms])
ffffffff811909ca __link_path_walk ([kernel.kallsyms])
ffffffff8119174a path_walk ([kernel.kallsyms])
ffffffff8119191b do_path_lookup ([kernel.kallsyms])
ffffffff811925a7 user_path_at ([kernel.kallsyms])
ffffffff811869bc vfs_fstatat ([kernel.kallsyms])
ffffffff81186b2b vfs_stat ([kernel.kallsyms])
ffffffff81186b54 sys_newstat ([kernel.kallsyms])
ffffffff8100b072 system_call_fastpath ([kernel.kallsyms])
320a6da735 __xstat64 (/lib64/libc-2.12.so)
7ff282d09247 Evaluate(RjNode*, RjHiderGlobals*)
(/home/mark/built/rathiders.so)
7ff283701585 RjHiderEvaluate (/mnt/scratch/radford/librj.so)
7ff283701585 RjHiderEvaluate (/mnt/scratch/radford/librj.so)
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