On Tue, 22 May 2007 17:19:52 +0000
Maxim Uvarov <[email protected]> wrote:
> Sorry for bothering you. I know you are very busy but could
> you please tell me what is situation of this patch?
I'd like to add the context-switch accounting to the taskstats payload.
As we'd then need to uprev the taskstats payload and version it makes sense
to have a look around, see if there's anything else which should be in
there but got missed.
I don't think we can accept the number-of-syscalls accounting feature. It
adds a memory increment into the kernel's number-one hotpath. Something
which people like to obsessively microbenchmark.
And as I said earlier, a 32-bit counter can be overflowed in mere seconds,
so that needs to become 64-bit, in which case we add a memory increment and
a test-n-branch to that hottest path.
There _is_ some cumulative overhead here, and I don't see how the value of
the syscall counter can justify it.
-
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]
