Ingo Molnar wrote:
the ratio between the number of syscalls vs. the number of context
switches is 1-2 orders of magnitude. So a loss of 9 cycles in the
syscall path is roughly equal to a loss of 90-900 cycles in switch_to()
costs ...
I agree.
the TLS ABI is just a gcc stupidity. Why did they pick the _second_
extra selector, instead of the first one ...?
Well, it doesn't matter which they chose if its the same for user and
kernel space. Why does x86-64 have swapgs rather than swapfs?
Anyway, perhaps this could
be solved by extending gcc with a switch to also generate __thread code
off %fs. Probably not worth the pain though ...
If there's gcc hacking to be done, it would be trying to get it make the
TLS offsets from the PDA/TCB positive rather than negative...
J
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
