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/
