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Linus, Ulrich,
here is some code so we can argue about real stuff.
the attached fastcall-2.3.31-B3 patch is a port of my fastcall-2.1.105-B
patch to pre1-2.3.31, it implements the Intel SYSENTER/SYSEXIT fast system
call entry points. (porting this to K6/K7 CPUs is not hard)
(you can find the original 1+ years old fastcall-2.1.105-B patch under
http://www.uwsg.indiana.edu/hypermail/linux/kernel/9806.1/0878.html -
hypermail indexing got my name wrong.)
the patch fixes a couple of problems in fastcall-2.1.105-B, and should be
a 'complete' implementation, all system calls under all circumstances
should work. It's been tested on SMP.
i've also attached a small testing program:
moon:~/fastcall> ./fastcall
(INT $0x80 based getpid(), got pid 900) latency:296 cycles
(SYSENTER based getpid(), got pid 900) latency:126 cycles
so the null-syscall latency speedup is ~135%!
the patch aims to handle all the boundary cases, ie. CPUs without
SYSENTER/SYSEXIT will work just fine (because the system call entry path
is completely split). User-space is not trusted to put a valid value into
%%ebp either, full exception handling all along the way.
*NOTE*. Although the patch does reload an MSR in switch_to(),
context-switch times do not get slower. Think about it.
suggestion: since we can control all the fastcall stubs on the glibc side,
i'd like to implement a different approach for 5 and 6-parameter system
calls. Only a minority of system calls has so many arguments, and those
can take some overhead anyway (since they are complex, obviously). The
solution would be to wrap all >4 parameter system calls into a special
4-parameter setup, where the 4th parameter points to an on-stack array of
2 or 3 additional parameters, which would be fetched (in a safe manner) by
arch/i386 and the generic system calls would be called with 5 or 6
parameters. This would speed up fast system calls by an additional 5%.
This means that the syscall table has to be split between fast and 'slow'
system calls - this is not a problem i believe, only one table will be
active for any given running kernel, so it's not a cache footprint
problem. If there are no conceptual objections, then i'd like to start
implementing this ASAP.
comments, flames, suggestions, bug/success reports welcome.
-- mingo
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