[Crash-utility] Issues with kmem -i

[Dave Anderson]

Sharyathi Nagesh wrote:

> On executing kmem -i over dump we are seeing these results
>
> crash> kmem -i
>                 PAGES        TOTAL      PERCENTAGE
>    TOTAL MEM   128778       503 MB         ----
>         FREE    44244     172.8 MB   34% of TOTAL MEM
>         USED    84534     330.2 MB   65% of TOTAL MEM
>       SHARED    45690     178.5 MB   35% of TOTAL MEM
>      BUFFERS     4371      17.1 MB    3% of TOTAL MEM
>       CACHED    51358     200.6 MB   39% of TOTAL MEM
>         SLAB        0            0    0% of TOTAL MEM
>
>   TOTAL HIGH        0            0    0% of TOTAL MEM
>
> This is due to the fact that
> o mi->get_slabs field is turning out to be zero in dump_mem_map()
> function. This is happening as vt->PG_slab field is not getting updated
> with value(10 in this case) in vm_init(). This is happening as pte field
> is taken from page structure.
>         o Probable solutions: Hard code value vt->PG_slab ??

That makes the most sense at this point.  This is what I was
planning for vm_init():


@@ -694,7 +708,8 @@ vm_init(void)
                        vt->PG_slab = 10;
                else if (THIS_KERNEL_VERSION >= LINUX(2,6,0))
                        vt->PG_slab = 7;
-       }
+       } else if (THIS_KERNEL_VERSION >= LINUX(2,6,0))
+               vt->PG_slab = 7;
 }

 /*


>
>
> o The output is breaking as  totalhigh_pages is coming out zero,
> So part of code in function dump_kmeminfo()
> pct = freehighmem_pages ?
>                         (freehighmem_pages * 100)/totalhigh_pages : 0;
> Cause Arithmetic calculation error.
>
> Still looking into the problem.

I can't reproduce this one.  In your case though, with
about 500MB, both "freehighmem_pages" and "totalhigh_pages"
should both be zero, leading to a "pct" setting of 0.
Are you showing "freehighmem_pages" as non-zero?

Dave

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