On Wed, 25 Aug 2010 15:59:09 -0500 Matt Mackall mpm@selenic.com wrote:
On Tue, 2010-08-24 at 10:37 -0500, Christoph Lameter wrote:
On Tue, 24 Aug 2010, Matt Mackall wrote:
kmalloc-32 1113344 1113344 32 128 1 : tunables 0 0 0 : slabdata 8698 8698 0
That's /proc/slabinfo on my laptop with SLUB. It looks like my last reboot popped me back to 2.6.33 so it may also be old news, but I couldn't spot any reports with Google.
Boot with "slub_debug" as a kernel parameter
and then do a
cat /sys/kernel/slab/kmalloc-32/alloc_calls
to find the caller allocating the objets.
Still present in 2.6.35. Appears to be DRM:
845 drm_vm_open_locked+0x72/0x109 age=43/37572/59269 pid=2089cpus=0-1
That's after about a minute of uptime. Grows to 100k in about a day.
dmesg bits: [ 0.834653] [drm] Initialized drm 1.1.0 20060810 [ 0.834986] pci 0000:00:02.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16 [ 0.834995] pci 0000:00:02.0: setting latency timer to 64 [ 1.002572] mtrr: type mismatch for e0000000,10000000 old: write-back new: write-combining [ 1.002580] [drm] MTRR allocation failed. Graphics performance may suffer. [ 1.019880] acpi device:03: registered as cooling_device2 [ 1.021520] input: Video Bus as /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/LNXVIDEO:00/input/input3 [ 1.021543] ACPI: Video Device [GFX0] (multi-head: yes rom: no post: no) [ 1.021855] [drm] Initialized i915 1.6.0 20080730 for 0000:00:02.0 on minor 0
This is with:
00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (rev 03) 00:02.1 Display controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (rev 03)
Matt tells me that this (drop-dead box-killing!) bug is still present in current kernels. Could someone take a look please?
The code seems very simple, and I couldn't spot a problem. Probably this means that I'm even simpler.