On 23 February 2015 at 21:06, Antti Kantee <[email protected]> wrote:
> On 23/02/15 19:42, Justin Cormack wrote:
>> ok so it eventually has to allocate memory while initialising the
>> sysctl nodes and that is what causes it to reschedule.
>
> The malloc hypercall should never block and therefore never reschedule.
> Blocking, if it is allowed along the callpath, is handled in the rump
> kernel. Here "blocking" of course means blocking in rump kernel virtual
> time. If the malloc() or similar backend routine called by the
> hypercall implementation decides to e.g. do pageout, it will just appear
> like some instructions take a really long time, but, as opposed to
> rescheduling, will not cause incorrect execution in the rump kernel.
>
No it is not that, I mean this trace back from schedule
#0 schedule () at
/home/justin/frankenlibc/rumpsrc/lib/librumpuser/rumpfiber.c:158
#1 0x000000000056d61c in wait (msec=msec@entry=0, wh=0x7ffff7ff8350)
at /home/justin/frankenlibc/rumpsrc/lib/librumpuser/rumpfiber.c:645
#2 0x000000000056e3e3 in rumpuser_cv_wait (cv=0x7ffff7ff8350,
mtx=0x7ffff7ff82d0)
at /home/justin/frankenlibc/rumpsrc/lib/librumpuser/rumpfiber.c:989
#3 0x0000000000565bcd in docvwait (cv=0x8212b0 <oomwait>,
mtx=0x8212e8 <pdaemonmtx>, ts=0x0)
at /home/justin/frankenlibc/rumpsrc/sys/rump/librump/rumpkern/locks.c:359
#4 0x0000000000567156 in uvm_wait (msg=<optimised out>) at
/home/justin/frankenlibc/rumpsrc/sys/rump/librump/rumpkern/vm.c:976
#5 0x0000000000567639 in rump_hypermalloc (howmuch=12288,
alignment=4096, waitok=true, wmsg=0x5a586b "kmalloc")
at /home/justin/frankenlibc/rumpsrc/sys/rump/librump/rumpkern/vm.c:1222
#6 0x00000000005676b9 in uvm_km_kmem_alloc (vm=<optimised out>,
size=<optimised out>, flags=<optimised out>, addr=0x7fffffffdd58)
at /home/justin/frankenlibc/rumpsrc/sys/rump/librump/rumpkern/vm.c:788
#7 0x000000000052c6dc in kmem_intr_alloc (requested_size=<optimised
out>, kmflags=1)
at
/home/justin/frankenlibc/rumpsrc/sys/rump/librump/rumpkern/../../../kern/subr_kmem.c:272
#8 0x000000000056c378 in kern_malloc (size=<optimised out>, flags=4)
at
/home/justin/frankenlibc/rumpsrc/sys/rump/librump/rumpkern/../../../kern/kern_malloc.c:117
#9 0x000000000054a49f in sysctl_realloc (p=0x7ffff7fa0808)
at
/home/justin/frankenlibc/rumpsrc/sys/rump/librump/rumpkern/../../../kern/kern_sysctl.c:2690
#10 sysctl_create (name=<optimised out>, namelen=<optimised out>,
oldp=0x7fffffffe060, oldlenp=<optimised out>,
newp=<optimised out>, newlen=<optimised out>,
oname=0x7fffffffdfa0, l=0x0, rnode=0x7ffff7fa0808)
at
/home/justin/frankenlibc/rumpsrc/sys/rump/librump/rumpkern/../../../kern/kern_sysctl.c:1130
#11 0x000000000054b812 in sysctl_createv (log=0x0, cflags=<optimised
out>, rnode=<optimised out>, cnode=0x7fffffffe198,
flags=16777729, type=1, namep=0x57a6ec "anonportalgo", descr=0x0,
func=0x0, qv=0, newp=0x0, newlen=0)
at
/home/justin/frankenlibc/rumpsrc/sys/rump/librump/rumpkern/../../../kern/kern_sysctl.c:2070
#12 0x000000000043a8ec in sysctl_net_inet6_ip6_setup (clog=0x0)
at
/home/justin/frankenlibc/rumpsrc/sys/rump/net/lib/libnet/../../../../netinet6/ip6_input.c:1964
#13 ip6_init () at
/home/justin/frankenlibc/rumpsrc/sys/rump/net/lib/libnet/../../../../netinet6/ip6_input.c:171
#14 0x000000000049b203 in domain_attach (dp=0x7fd300 <rumpns_inet6domain>)
at
/home/justin/frankenlibc/rumpsrc/sys/rump/librump/rumpnet/../../../kern/uipc_domain.c:141
#15 0x000000000056b684 in rump_component_init
(type=type@entry=RUMP_COMPONENT_NET)
at /home/justin/frankenlibc/rumpsrc/sys/rump/librump/rumpkern/rump.c:600
#16 0x000000000048c184 in rumpcompinitRUMP__FACTION_NET () at
/home/justin/frankenlibc/rumpsrc/sys/rump/librump/rumpnet/rump_net.c:54
#17 0x000000000056b684 in rump_component_init (type=RUMP__FACTION_NET)
at /home/justin/frankenlibc/rumpsrc/sys/rump/librump/rumpkern/rump.c:600
#18 0x000000000056bb85 in rump_init () at
/home/justin/frankenlibc/rumpsrc/sys/rump/librump/rumpkern/rump.c:446
#19 0x00000000004014f4 in __libc_start_main (main=0x401540 <main>,
argc=1, argv=0x7fffffffe418, envp=0x7fffffffe428) at crti.c:42
#20 0x000000000056e64f in __platform_init (main=0x401540 <main>,
argc=1, argv=0x7fffffffe418) at __platform_init.c:15
#21 0x000000000040146a in _start ()
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