Re: [LIP] kernel generating SIGBUS while handling pagefault

Hello Arun,

Thanks for your reply. The following are the meminfo details

<------meminfo of machine using 5GB RAM and on which SIGBUS
occurs------------------>
        total:    used:    free:  shared: buffers:  cached:
Mem:  5042049024 1733447680 3308601344        0 49741824 1476390912
Swap: 34356985856 16637952 34340347904
MemTotal:      4923876 kB
MemFree:       3231056 kB
MemShared:           0 kB
Buffers:         48576 kB
Cached:        1434048 kB
SwapCached:       7740 kB
Active:         581040 kB
ActiveAnon:      66760 kB
ActiveCache:    514280 kB
Inact_dirty:    704220 kB
Inact_laundry:  156312 kB
Inact_clean:    115244 kB
Inact_target:   311360 kB
HighTotal:           0 kB
HighFree:            0 kB
LowTotal:      4923876 kB
LowFree:       3231056 kB
SwapTotal:    33551744 kB
SwapFree:     33535496 kB
HugePages_Total:     0
HugePages_Free:      0
Hugepagesize:     2048 kB
<-------------------------------------------------------------------------------------------------------->

<---------machine on which SIGBUS dont occur 8GB RAM and 16 GB
SWAP---------------------------------------->
        total:    used:    free:  shared: buffers:  cached:
Mem:  8229769216 1131577344 7098191872        0 40124416 834015232
Swap: 17174102016        0 17174102016
MemTotal:      8036884 kB
MemFree:       6931828 kB
MemShared:           0 kB
Buffers:         39184 kB
Cached:         814468 kB
SwapCached:          0 kB
Active:         266048 kB
ActiveAnon:      98668 kB
ActiveCache:    167380 kB
Inact_dirty:    716388 kB
Inact_laundry:       0 kB
Inact_clean:         0 kB
Inact_target:   196484 kB
HighTotal:           0 kB
HighFree:            0 kB
LowTotal:      8036884 kB
LowFree:       6931828 kB
SwapTotal:    16771584 kB
SwapFree:     16771584 kB
HugePages_Total:     0
HugePages_Free:      0
Hugepagesize:     2048 kB
<---------------------------------------------------------------------->

SIGBUS is being propagated to the userland as kernel unable to handle
it (I think the kernel code is not retrying as this may lead to
deadlock), so can I ignore SIGBUS and retry doing this (accessing the
page) ?

Looking forward to hear from you.

Best,
Vamsi


On 6/2/05, Arun Sharma <[email protected]> wrote:
> On Wed, Jun 01, 2005 at 03:08:11PM +0530, vamsi krishna wrote:
> > I see some system calls failing with 'Cannot allocate memory', is this
> > because that I use only 5GB of RAM for a 64-bit machine?
> >
> > Can some one kindly give some inputs in this?
> 
> You didn't post the most important data:
> 
> /proc/meminfo
> 
>         -Arun
> 
> 
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