Hi Johannes,

On Wed, Aug 7, 2013 at 9:16 PM, Johannes Weiner <hannes@cmpxchg.org> wrote:

Patch on top of mmotm:

---
From: Johannes Weiner <hannes@cmpxchg.org>
Subject: [patch] mm: page_alloc: use vmstats for fair zone allocation batching

Avoid dirtying the same cache line with every single page allocation
by making the fair per-zone allocation batch a vmstat item, which will
turn it into batched percpu counters on SMP.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>

I bisected several boot failures on various ARM platform in next-20130816 down to this patch (commit 67131f9837 in linux-next.) Simply reverting it got things booting again on top of -next. Example boot crash below.

Kevin

[ 0.000000] Booting Linux on physical CPU 0x0

[ 0.000000] Linux version 3.11.0-rc5-next-20130816 (khilman@paris) (gcc version 4.7.2 (Ubuntu/Linaro 4.7.2-1ubuntu1) ) #30 SMP Fri Aug 16 09:47:32 PDT 2013

[ 0.000000] CPU: ARMv7 Processor [413fc082] revision 2 (ARMv7), cr=10c53c7d

[ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache

[ 0.000000] Machine: Generic AM33XX (Flattened Device Tree), model: TI AM335x BeagleBone

[ 0.000000] bootconsole [earlycon0] enabled

[ 0.000000] Memory policy: ECC disabled, Data cache writeback

[ 0.000000] On node 0 totalpages: 130816

[ 0.000000] free_area_init_node: node 0, pgdat c081d400, node_mem_map c12fc000

[ 0.000000] Normal zone: 1024 pages used for memmap

[ 0.000000] Normal zone: 0 pages reserved

[ 0.000000] Unable to handle kernel NULL pointer dereference at virtual address 00000026

[ 0.000000] pgd = c0004000

[ 0.000000] [00000026] *pgd=00000000

[ 0.000000] Internal error: Oops: 5 [#1] SMP ARM

[ 0.000000] Modules linked in:

[ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 3.11.0-rc5-next-20130816 #30

[ 0.000000] task: c0793c70 ti: c0788000 task.ti: c0788000

[ 0.000000] PC is at __mod_zone_page_state+0x2c/0xb4

[ 0.000000] LR is at mod_zone_page_state+0x2c/0x4c

[ 0.000000] pc : [<c00eb628>] lr : [<c00ebbf0>] psr: 60000193

[ 0.000000] sp : c0789e84 ip : 00000026 fp : c0789ef8

[ 0.000000] r10: c0789f04 r9 : c05149dc r8 : 00000000

[ 0.000000] r7 : 00000026 r6 : 00000000 r5 : c0791770 r4 : c0788000

[ 0.000000] r3 : 00000000 r2 : 0001fb00 r1 : 00000001 r0 : c081d400

[ 0.000000] Flags: nZCv IRQs off FIQs on Mode SVC_32 ISA ARM Segment kernel

[ 0.000000] Control: 10c5387d Table: 80004019 DAC: 00000017

[ 0>.000000] Process swapper (pid: 0, stack limit = 0xc0788240)

[ 0.000000] Stack: (0xc0789e84 to 0xc078a000)

[ 0.000000] 9e80: 60000193 0001fb00 00000001 c081d400 c0781570 c081d400 c081d400

[ 0.000000] 9ea0: 00000000 0001fb00 00020000 c0747dd4 c077c5f4 00000001 0009ff00 0001fb00

[ 0.000000] 9ec0: 00000400 00080000 00000000 bfffffff c07ebfb0 000a0000 c0789ef8 00080000

[ 0.000000] 9ee0: 000a0000 00020000 000001cf c07ec188 000000cf c072ef2c 00020000 00000000

[ 0.000000] 9f00: 00000000 00000100 00000000 00000000 00000000 00000000 c0821d0c dfefa000

[ 0.000000] 9f20: c07ebfb0 00000001 00000001 c073080c c0789fdc c076abd4 ffff1000 0009feff

[ 0.000000] 9f40: 00001000 00000007 c0734a14 c076abd4 c0821ca0 c0008000 c076c8f0 c07ec188

[ 0.000000] 9f60: 413fc082 c0789fdc c064b328 c072cc3c 00000000 10c53c7d c0d5e448 00000001

[ 0.000000] 9f80: 00000000 c076c8ec c079542c 80004059 413fc082 00000000 00000000 c04f6298

[ 0.000000] 9fa0: c064989c 00000001 00000000 c076c8ec c079542c 80004059 413fc082 00000000

[ 0.000000] 9fc0: 00000000 c07297ec 00000000 00000000 00000000 00000000 00000000 c076c8f0

[ 0.000000] 9fe0: 00000000 10c53c7d c07908e8 c076c8ec c079542c 80008074 00000000 00000000

[ 0.000000] [<c00eb628>] (__mod_zone_page_state+0x2c/0xb4) from [<c081d400>] (contig_page_data+0x0/0xd80)

[ 0.000000] Code: e7958103 e0867001 e2877025 e1a0c007 (e19cc0d8)

[ 0.000000] ---[ end trace 1b75b31a2719ed1c ]---