Re: [PATCH] x86: make PTRACE_GETREGSET return 32-bit regs if64-bit process entered kernel with int 80

From: Oleg Nesterov
Date: Fri Feb 15 2013 - 10:11:07 EST

On 02/15, Cyrill Gorcunov wrote:
> > strace needs to get that data on every syscall entry in the traced process.
> > Doing open/read/close on every syscall entry is going to slow it down a lot.
> Don't you need to read it only once when strace is attached? Compat flag can't
> be arbitrary dropped when program executes, no?

TS_COMPAT is set/cleared every time a 64bit task does int80.

I guess you need TIF_IA32, not TS_COMPAT, for c/r.


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