A patch added (Resend).
Sorry for forgetting the patch.
>On 23 May 2006, at 05:52, Atsushi SAKAI wrote:
>
>> This is a Patch for Trace Buffer allocation Error.
>
>No patch attached.
>
> -- Keir
>
>
This is a body of previous mail.
Thanks,
Atsushi Sakai
=======================
Hi, All.
This is a Patch for Trace Buffer allocation Error.
Currently, Trace Buffer Management uses two variables
(opt_tbuf_size & tb_init_done)
Variable "opt_tbuf_size" is setting a tbuf_size and keeps the tbuf_size.
Variable "tb_init_done" is a flag to do trace buffer process.
This flag is set by tb_control() DOM0_TBUF_ENABLE with the condition of
opt_tbuf_size > 0.
The trace buffer(tbuf_size) is allocated by is alloc_trace_bufs().
This function used by two functions(tb_set_size() and init_trace_bufs())
In tb_set_size(), the alloc_trace_bufs() failure is cared collectly by setting
opt_tbuf_size=0.
But in init_trace_bufs(), the alloc_trace_bufs() failure is not cared collectry
(KEEP opt_tbuf_size = n ).
(init_trace_bufs() calls at x86/setup.c & ia64/xensetup.c)
This problem occured in following steps.
1)tbuf_size = n in xen boot option
2)tbuf_size is too large and memory allocation fails.
3)tbctl 1(TraceBuffer Enable tb_init_done set to 1.)
(because opt_tbuf_size keeps n)
(tbctl calls tb_control DOM0_TBUF_ENABLE)
Current xen-unstable(CS10068), tbctl function is moved to get_tbuf(in
xentrace & xenbaked)
So 3) and 4) are occured at once.
But Current xen-ia64-unstable(CS10029) still remain tbctl.
4)tracebuffer collection process start working
(But trace buffer is not allocated)
5)tracebuffer collection process halted
because no trace buffers,
To avoid this problem I changed the location of error collection code
opt_tbuf_size = 0;
from tb_set_size() to alloc_trace_bufs().
Because 1)allocation error is occured in alloc_trace_bufs()
and 2)init_trace_bufs() mis-allocation is also cared.
Signed-off-by: Atsushi SAKAI <sakaia@xxxxxxxxxxxxxx>
Attachment:
tb_alloc.patch
Description: Binary data
_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel