Lustre discuss - Nov 2008 - failure to allocate a tage

Dear list,
   There are some " failure to allocate a tage(XX)" in our oss log,
what does
this mean ?

Wang lu writes:
 > Dear list,

Hello,

 >    There are some " failure to allocate a tage(XX)" in our oss
log, what does
 > this mean ?

this means that the Lustre logging subsystem cannot allocate a page to
store CDEBUG() messages. Often this means that messages are generated
faster than debug_daemon manages to dump them to the log file. As a
result, some parts of a debugging log will be lost, which is not
especially important, unless you need the log to trace some problem.

Nikita.

And what does "ll_ost_io_**: page allocation failure" mean?

Nov 24 20:52:21 boss01 kernel: ll_ost_io_383: page allocation failure. order:4,
mode:0x50
Nov 24 20:52:21 boss01 kernel:  [<c01425cc>] __alloc_pages+0x294/0x2a6
Nov 24 20:52:21 boss01 kernel:  [<c01425f6>] __get_free_pages+0x18/0x24 
Nov 24 20:52:21 boss01 kernel:  [<c01451ed>] kmem_getpages+0x1c/0xbb
Nov 24 20:52:21 boss01 kernel:  [<c0145d3b>] cache_grow+0xab/0x138
Nov 24 20:52:21 boss01 kernel:  [<c0145f2d>]<4>ll_ost_io_137: page
allocation
failure. order:4, mode:0x50
Nov 24 20:52:21 boss01 kernel:  [<c01425cc>]
cache_alloc_refill+0x165/0x19d
Nov 24 20:52:21 boss01 kernel:  [<c0146301>] __alloc_pages+0x294/0x2a6
Nov 24 20:52:21 boss01 kernel:  [<c01425f6>] __kmalloc+0x76/0x88
Nov 24 20:52:21 boss01 kernel:  [<f9650369>] cfs_alloc+0x29/0x70 [libcfs]
Nov 24 20:52:21 boss01 kernel:  [<fae1a75f>]
lprocfs_alloc_stats+0x11f/0x5b0
[obdclass]


Nikita Danilov ?:
> Wang lu writes:
>  > Dear list,
> 
> Hello,
> 
>  >    There are some " failure to allocate a tage(XX)" in our
oss log, what
does
>  > this mean ?
> 
> this means that the Lustre logging subsystem cannot allocate a page to
> store CDEBUG() messages. Often this means that messages are generated
> faster than debug_daemon manages to dump them to the log file. As a
> result, some parts of a debugging log will be lost, which is not
> especially important, unless you need the log to trace some problem.
> 
> Nikita.