ftrace,bpf: Use single direct ops for bpf trampolines #6029
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Upstream branch: 8b52d09 |
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Make alloc_and_copy_ftrace_hash to copy also direct address for each hash entry. Signed-off-by: Jiri Olsa <[email protected]>
Adding register_ftrace_direct_hash function that registers all entries (ip -> direct) provided in hash argument. The difference to current register_ftrace_direct is - hash argument that allows to register multiple ip -> direct entries at once - we can call register_ftrace_direct_hash multiple times on the same ftrace_ops object, becase after first registration with register_ftrace_function_nolock, it uses ftrace_update_ops to update the ftrace_ops object This change will allow us to have simple ftrace_ops for all bpf direct interface users in following changes. Signed-off-by: Jiri Olsa <[email protected]>
Adding unregister_ftrace_direct_hash function that unregisters all entries (ip -> direct) provided in hash argument. The difference to current unregister_ftrace_direct is - hash argument that allows to unregister multiple ip -> direct entries at once - we can call unregister_ftrace_direct_hash multiple times on the same ftrace_ops object, becase we do not need to unregister all entries at once, we can do it gradualy with the help of ftrace_update_ops function This change will allow us to have simple ftrace_ops for all bpf direct interface users in following changes. Signed-off-by: Jiri Olsa <[email protected]>
Adding modify_ftrace_direct_hash function that modifies all entries (ip -> direct) provided in hash argument. The difference to current unregister_ftrace_direct is - hash argument that allows to modify multiple ip -> direct entries at once This change will allow us to have simple ftrace_ops for all bpf direct interface users in following changes. Signed-off-by: Jiri Olsa <[email protected]>
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Upstream branch: 34f033a |
We are going to use these functions in following changes. Signed-off-by: Jiri Olsa <[email protected]>
Implement current *_ftrace_direct function with their *_hash function counterparts. Signed-off-by: Jiri Olsa <[email protected]>
Following changes need to lookup trampoline based on its ip address, adding hash table for that. Signed-off-by: Jiri Olsa <[email protected]>
We are going to remove "ftrace_ops->private == bpf_trampoline" setup in following changes. Adding ip argument to ftrace_ops_func_t callback function, so we can use it to look up the trampoline. Signed-off-by: Jiri Olsa <[email protected]>
Using single ftrace_ops for direct calls update instead of allocating ftrace_ops obejct for each trampoline. At the moment we can enable this only on x86 arch, because arm relies on ftrace_ops object representing just single trampoline image (stored in ftrace_ops::direct_call). Adding HAVE_SINGLE_FTRACE_DIRECT_OPS config option to be enabled on each arch that supports this. Signed-off-by: Jiri Olsa <[email protected]>
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At least one diff in series https://patchwork.kernel.org/project/netdevbpf/list/?series=1005443 irrelevant now. Closing PR. |
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Pull request for series with
subject: ftrace,bpf: Use single direct ops for bpf trampolines
version: 1
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=1005443