[ltt-dev] syscall id limited to 16 bits

[Mathieu Desnoyers]

* Matthieu CASTET (matthieu.castet at parrot.com) wrote:
> Hi,
> 
> in the ltt patch used for 2.6.27, syscall trace only report the syscall
> id on 16 bits [1].
> 
> This is wrong. For example on arm, there are private arch syscall in the
> range 0xf0000-0xfffff (for example set_tls).
> For this syscall the kernel.syscall_entry trace get the id truncated.
> 

Patches would be welcome ;)

Mathieu

> 
> Matthieu
> 
> 
> [1] look at the (unsigned short) cast on id
> +notrace void probe_syscall_entry(struct pt_regs *regs, long id)
> +{
> +       struct marker *marker;
> +       struct serialize_long_short data;
> +
> +       data.f1 = instruction_pointer(regs);
> +       data.f2 = (unsigned short)id;
> +
> +       marker = &GET_MARKER(kernel, syscall_entry);
> +       ltt_specialized_trace(marker, marker->single.probe_private,
> +               &data, serialize_sizeof(data), sizeof(long));
> +}
> 
> 
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-- 
Mathieu Desnoyers
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