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 ??

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.

Dave Please go through my observation. > > 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; > } here for the dump I was looking into vt->PG_slab needs to be set to 10 and not 7. as slab value was 1024 in dump_mem_map() function.

> /* > > > > > > > > > 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 I could see totalhigh_pages coming out zero which was the right thing (As it was x86_64 machine) but freehighmem_pages came out as a non zero quantity. In function :dump_free_pages_zones_v2(). I could see vt->nr_zones as 4 which I feel is incorrect and hence it entered the block if (i == ZONE_HIGHMEM) { readmem(node_zones+ OFFSET(zone_free_pages), KVADDR, &value, sizeof(ulong), "node_zones free_pages", FAULT_ON_ERROR); sum += value; } and sum was updated with a value and hence freehighmem_pages causing Arithmetic exception