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SubjectRe: Kernel 2.6.9 Multiple Page Allocation Failures
On Wed, Nov 10, 2004 at 10:28:18PM +0100, Lukas Hejtmanek wrote:
> On Tue, Nov 09, 2004 at 06:33:48PM -0200, Marcelo Tosatti wrote:
> > So you can be hitting the e1000/TSO issue - care to retest with
> > 2.6.10-rc1-mm3/4 please?
> >
> > Thanks a lot for testing!
>
> This is from 2.6.10-rc1-mm3: (i added show_free..)
>
> swapper: page allocation failure. order:0, mode:0x20
> [<c0137f28>] __alloc_pages+0x242/0x40e
> [<c0138119>] __get_free_pages+0x25/0x3f
> [<c032ed55>] tcp_v4_rcv+0x69a/0x9b5
> [<c013b189>] kmem_getpages+0x21/0xc9
> [<c013be3a>] cache_grow+0xab/0x14d
> [<c013c05e>] cache_alloc_refill+0x182/0x244
> [<c013c3ec>] __kmalloc+0x85/0x8c
> [<c02fac89>] alloc_skb+0x47/0xe0
> [<c02997ca>] e1000_alloc_rx_buffers+0x44/0xe3
> [<c029944b>] e1000_clean_rx_irq+0x17c/0x4b7
> [<c0298fd0>] e1000_clean+0x51/0xe7
> [<c03010dc>] net_rx_action+0x7f/0x11f
> [<c011daa3>] __do_softirq+0xb7/0xc6
> [<c011dadf>] do_softirq+0x2d/0x2f
> [<c010614e>] do_IRQ+0x1e/0x24
> [<c0104756>] common_interrupt+0x1a/0x20
> [<c0101eae>] default_idle+0x0/0x2c
> [<c0101ed7>] default_idle+0x29/0x2c
> [<c0101f40>] cpu_idle+0x33/0x3c
> [<c0448a1f>] start_kernel+0x14c/0x165
> [<c04484bd>] unknown_bootoption+0x0/0x1ab
> DMA per-cpu:
> cpu 0 hot: low 2, high 6, batch 1
> cpu 0 cold: low 0, high 2, batch 1
> cpu 1 hot: low 2, high 6, batch 1
> cpu 1 cold: low 0, high 2, batch 1
> Normal per-cpu:
> cpu 0 hot: low 32, high 96, batch 16
> cpu 0 cold: low 0, high 32, batch 16
> cpu 1 hot: low 32, high 96, batch 16
> cpu 1 cold: low 0, high 32, batch 16
> HighMem per-cpu:
> cpu 0 hot: low 14, high 42, batch 7
> cpu 0 cold: low 0, high 14, batch 7
> cpu 1 hot: low 14, high 42, batch 7
> cpu 1 cold: low 0, high 14, batch 7
> Free pages: 532kB (252kB HighMem)
> Active:39820 inactive:208936 dirty:104508 writeback:672 unstable:0 free:133 slab:7779 mapped:15810 pagetables:410
> DMA free:8kB min:12kB low:24kB high:36kB active:384kB inactive:11400kB present:16384kB pages_scanned:192 all_unreclaimable? no
> protections[]: 0 0 0
> DMA: 0*4kB 1*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 8kB
> Normal: 0*4kB 0*8kB 1*16kB 0*32kB 0*64kB 0*128kB 1*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 272kB
> HighMem: 15*4kB 8*8kB 2*16kB 1*32kB 1*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 252kB
> Swap cache: add 1, delete 0, find 0/0, race 0+0
> printk: 696 messages suppressed.
> swapper: page allocation failure. order:0, mode:0x20

OK, do you have Nick watermark fixes in?

They increase the GFP_ATOMIC buffer (memory reserved for GFP_ATOMIC allocations)
significantly, which is exactly the case here.

Its in Andrew's -mm tree already (the last -mm-bk contains it).

Its attached just in case - hope it ends this story.






---

linux-2.6-npiggin/mm/page_alloc.c | 41 +++++++++++++++++++++-----------------
1 files changed, 23 insertions(+), 18 deletions(-)

diff -puN mm/page_alloc.c~mm-restore-atomic-buffer mm/page_alloc.c
--- linux-2.6/mm/page_alloc.c~mm-restore-atomic-buffer 2004-11-10 15:13:33.000000000 +1100
+++ linux-2.6-npiggin/mm/page_alloc.c 2004-11-10 14:57:54.000000000 +1100
@@ -1935,8 +1935,12 @@ static void setup_per_zone_pages_min(voi
lowmem_pages;
}

- zone->pages_low = zone->pages_min * 2;
- zone->pages_high = zone->pages_min * 3;
+ /*
+ * When interpreting these watermarks, just keep in mind that:
+ * zone->pages_min == (zone->pages_min * 4) / 4;
+ */
+ zone->pages_low = (zone->pages_min * 5) / 4;
+ zone->pages_high = (zone->pages_min * 6) / 4;
spin_unlock_irqrestore(&zone->lru_lock, flags);
}
}
@@ -1945,24 +1949,25 @@ static void setup_per_zone_pages_min(voi
* Initialise min_free_kbytes.
*
* For small machines we want it small (128k min). For large machines
- * we want it large (16MB max). But it is not linear, because network
+ * we want it large (64MB max). But it is not linear, because network
* bandwidth does not increase linearly with machine size. We use
*
- * min_free_kbytes = sqrt(lowmem_kbytes)
+ * min_free_kbytes = 4 * sqrt(lowmem_kbytes), for better accuracy:
+ * min_free_kbytes = sqrt(lowmem_kbytes * 16)
*
* which yields
*
- * 16MB: 128k
- * 32MB: 181k
- * 64MB: 256k
- * 128MB: 362k
- * 256MB: 512k
- * 512MB: 724k
- * 1024MB: 1024k
- * 2048MB: 1448k
- * 4096MB: 2048k
- * 8192MB: 2896k
- * 16384MB: 4096k
+ * 16MB: 512k
+ * 32MB: 724k
+ * 64MB: 1024k
+ * 128MB: 1448k
+ * 256MB: 2048k
+ * 512MB: 2896k
+ * 1024MB: 4096k
+ * 2048MB: 5792k
+ * 4096MB: 8192k
+ * 8192MB: 11584k
+ * 16384MB: 16384k
*/
static int __init init_per_zone_pages_min(void)
{
@@ -1970,11 +1975,11 @@ static int __init init_per_zone_pages_mi

lowmem_kbytes = nr_free_buffer_pages() * (PAGE_SIZE >> 10);

- min_free_kbytes = int_sqrt(lowmem_kbytes);
+ min_free_kbytes = int_sqrt(lowmem_kbytes * 16);
if (min_free_kbytes < 128)
min_free_kbytes = 128;
- if (min_free_kbytes > 16384)
- min_free_kbytes = 16384;
+ if (min_free_kbytes > 65536)
+ min_free_kbytes = 65536;
setup_per_zone_pages_min();
setup_per_zone_protection();
return 0;
_
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