* drepper@xxxxxxxxx <drepper@xxxxxxxxx> wrote: > On Thu, Mar 18, 2010 at 12:15, Ingo Molnar <mingo@xxxxxxx> wrote: > > > I didnt say it's glibc's fault - if then it's more of the kernel's fault > > as most of the complexity is on that side. I said it's due to the > > fundamental distance between the app that makes use of it, the library and > > the kernel, and the resulting difficulties in getting a combined solution > > out. > > This is wrong, too. Once there is a kernel patch that has a reasonable > syscall interface it's easy enough to hack up the glibc side. [...] Where 'reasonable' is defined by you, right? As i said, the KAIO situation is mostly the kernel's fault, but you are a pretty passive and unhelpful entity in this matter too, arent you? For example, just to state the obvious: libaio has been written 8 years ago in 2002 and has been used in apps early on. Why arent those kernel APIs, while not being a full/complete solution, supported by glibc, and wrapped to pthreads based emulation on kernels that dont support it? I'm not talking about a 100% full POSIX AIO implementation (the kernel side is not complete enough for that) - i'm just talking about the APIs that libaio and the kernel supports today. Why isnt glibc itself making use of those AIO capabilities internally? (even if it's not possible to support full POSIX AIO) I checked today's glibc repo, and there's no sign of any of that: glibc> git grep io_submit glibc> git grep aio_context_t glibc> Zero, nil, nada. Getting _something_ into glibc would certainly help move the situation. Glibc itself using existing KAIO bits internally would help too and dont tell me it's 100% unusable: it's certainly capable enough to run DB servers. glibc using it would create further demand (and pressure, and incentives) for improvements. There were even glibc patches created by Ben LaHaise for some of these bits, IIRC. One can certainly make the argument that glibc not using _any_ of the current KAIO capabilities harms its further development. > [...] Don't try to artificially find an argument to support your thesis. Charming argumentation style, i really missed it. Thanks, Ingo -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
