Re: [PATCH 0/6] [RFC] Sizing zones and holes in an architecture independent manner

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On Wed, 12 Apr 2006, Luck, Tony wrote:

On Wed, Apr 12, 2006 at 05:00:32PM +0100, Mel Gorman wrote:
Patch is attached as 105-ia64_use_init_nodes.patch until I beat sense into
my mail setup. I've added Bob Picco to the cc list as he will hit the same
issue with whitespace corruption.

Ok!  That boots on the tiger_defconfig.

Some stuff is weird in the dmesg output though.

Ok, I see the problem. It happened because the zone boundary between DMA and NORMAL was in a hole.

When I am working out the size of a hole, I check the zone for the end_pfn of one active range is the same zone as the start_pfn in the next range. In this case, the end of area 1 is 131020 in DMA and the start of area 2 is 393216 in NORMAL so the hole does not get accounted for.

You report about
twice as many pages in each zone, but then the total memory is
about right.  Here's the diff of my regular kernel (got a bunch of
patches post-2.6.17-rc1) against a 2.6.17-rc1 with your patches
applied.  Note also that the Dentry and Inode caches allocated
twice as much space (presumably based on the belief that there
is more memory).  My guess is that you are counting the holes.

-Tony

19,21c20,37
< On node 0 totalpages: 260725
<   DMA zone: 129700 pages, LIFO batch:7
<   Normal zone: 131025 pages, LIFO batch:7
---
add_active_range(0, 1024, 130688): New
add_active_range(0, 130984, 131020): New
add_active_range(0, 393216, 524164): New
add_active_range(0, 524192, 524269): New
Dumping sorted node map
entry 0: 0  1024 -> 130688
entry 1: 0  130984 -> 131020
entry 2: 0  393216 -> 524164
entry 3: 0  524192 -> 524269
Hole found index 0: 1024 -> 1024
Hole found index 1: 130688 -> 130984
Hole found index 3: 524164 -> 524192
On node 0 totalpages: 522921
Hole found index 0: 1024 -> 1024
Hole found index 1: 130688 -> 130984
  DMA zone: 260824 pages, LIFO batch:7
Hole found index 3: 524164 -> 524192
  Normal zone: 262097 pages, LIFO batch:7
25c41
< Kernel command line: BOOT_IMAGE=scsi0:EFI\redhat\l-tiger-smp.gz  root=LABEL=/ console=tty1 console=ttyS1,115200 ro
---
Kernel command line: BOOT_IMAGE=scsi0:EFI\redhat\l-tiger-smpxx.gz  root=LABEL=/ console=uart,io,0x2f8 ro
29,30c45,46
< Dentry cache hash table entries: 524288 (order: 8, 4194304 bytes)
< Inode-cache hash table entries: 262144 (order: 7, 2097152 bytes)
---
Dentry cache hash table entries: 1048576 (order: 9, 8388608 bytes)
Inode-cache hash table entries: 524288 (order: 8, 4194304 bytes)
32c48
< Memory: 4070560k/4171600k available (6836k code, 99792k reserved, 2749k data, 256k init)
---
Memory: 4064416k/4171600k available (6832k code, 105936k reserved, 2753k data, 256k init)


--
Mel Gorman
Part-time Phd Student                          Linux Technology Center
University of Limerick                         IBM Dublin Software Lab
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