Hi Dave,
On 9/17/2019 2:40 PM, Dave Anderson wrote:
>
> Hi Kazu,
>
> This seems to be an extrememly rare condition, but in any case, your
> patch is the correct thing to do.
>
> However, I do have two dumpfiles where the change causes the warning message
> to be displayed unnecessarily, which was only meant to be displayed if the
> mem_map cache is *not* virtually-mapped. But the single check for
> !(vt->flags & V_MEM_MAP) is not always sufficient, so it should also
> check for !(machdep->flags & VMEMMAP) like so:
>
> --- a/memory.c 2019-09-17 14:20:24.586069004 -0400
> +++ b/memory.c 2019-09-17 14:36:36.765286602 -0400
> @@ -6348,13 +6348,13 @@ fill_mem_map_cache(ulong pp, ulong ppend
> if (cnt > size)
> cnt = size;
>
> - if (!readmem(addr, KVADDR, bufptr, size,
> + if (!readmem(addr, KVADDR, bufptr, cnt,
> "virtual page struct cache", RETURN_ON_ERROR|QUIET)) {
> - BZERO(bufptr, size);
> - if (!(vt->flags & V_MEM_MAP) && ((addr+size) < ppend))
> + BZERO(bufptr, cnt);
> + if (!((vt->flags & V_MEM_MAP) || (machdep->flags & VMEMMAP)) && ((addr+cnt) < ppend))
> error(WARNING,
> "mem_map[] from %lx to %lx not accessible\n",
> - addr, addr+size);
> + addr, addr+cnt);
> }
>
> addr += cnt;
>
> You OK with that?
I'm OK, thanks!
Kazu
>
> Thanks,
> Dave
>
>
>
>
>
>
> ----- Original Message -----
>> Hi Kazu,
>>
>> I will be out of the office until Monday September 16th. I will check
>> out your patch when I get back.
>>
>> Thanks,
>> Dave
>>
>>
>> ----- Original Message -----
>>>
>>> fill_mem_map_cache() intends to read page-size-or-less size if it cannot
>>> read the whole cache size, but it seems it doesn't correctly, and shows
>>> just zero for existing data.
>>>
>>> crash> kmem -p 1000
>>> PAGE PHYSICAL MAPPING INDEX CNT FLAGS
>>> ffffea0000000040 1000 0 0 0 0
>>> crash> rd ffffea0000000040
>>> ffffea0000000040: 000fffff00000400 ........
>>>
>>> I think the size below should be cnt, and confirmed that the patch works
>>> well with a dump by makedumpfile -e option.
>>>
>>> Signed-off-by: Kazuhito Hagio <k-hagio@xxxxxxxxxxxxx>
>>> ---
>>> memory.c | 8 ++++----
>>> 1 file changed, 4 insertions(+), 4 deletions(-)
>>>
>>> diff --git a/memory.c b/memory.c
>>> index ac7e73679405..4584673ed0ae 100644
>>> --- a/memory.c
>>> +++ b/memory.c
>>> @@ -6348,13 +6348,13 @@ fill_mem_map_cache(ulong pp, ulong ppend, char
>>> *page_cache)
>>> if (cnt > size)
>>> cnt = size;
>>>
>>> - if (!readmem(addr, KVADDR, bufptr, size,
>>> + if (!readmem(addr, KVADDR, bufptr, cnt,
>>> "virtual page struct cache", RETURN_ON_ERROR|QUIET)) {
>>> - BZERO(bufptr, size);
>>> - if (!(vt->flags & V_MEM_MAP) && ((addr+size) <
>>> ppend))
>>> + BZERO(bufptr, cnt);
>>> + if (!(vt->flags & V_MEM_MAP) && ((addr+cnt) <
>>> ppend))
>>> error(WARNING,
>>> "mem_map[] from %lx to %lx not
>>> accessible\n",
>>> - addr, addr+size);
>>> + addr, addr+cnt);
>>> }
>>>
>>> addr += cnt;
>>> --
>>> 2.18.1
>>>
>>
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>
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