On Wed, Oct 29, 2008 at 12:29:44AM +0100, Nick Piggin wrote:
> On Tue, Oct 28, 2008 at 08:55:13PM -0200, Glauber Costa wrote:
> > Commit db64fe02258f1507e13fe5212a989922323685ce broke
> > KVM (the symptom) for me. The cause is that vmalloc
> > allocations fail, despite of the fact that /proc/meminfo
> > shows plenty of vmalloc space available.
> >
> > After some investigation, it seems to me that the current
> > way to compute the next addr in the rb-tree transversal
> > leaves a spare page between each allocation. After a few
> > allocations, regardless of their size, we run out of vmalloc
> > space.
>
> Right... that was to add a guard page like the old vmalloc allocator.
> vmallocs still add their extra page too, so most of them will have
> a 2 page guard area, but I didn't think this would hurt significantly.
>
> I'm not against the patch, but I wonder exactly what is filling it up
> and how? (can you look at the vmalloc proc function to find out?)
attached.
>
> >
> > Signed-off-by: Glauber Costa <[EMAIL PROTECTED]>
> > Cc: Jeremy Fitzhardinge <[EMAIL PROTECTED]>
> > Cc: Krzysztof Helt <[EMAIL PROTECTED]>
> > ---
> > mm/vmalloc.c | 2 +-
> > 1 files changed, 1 insertions(+), 1 deletions(-)
> >
> > diff --git a/mm/vmalloc.c b/mm/vmalloc.c
> > index 0365369..a33b0d1 100644
> > --- a/mm/vmalloc.c
> > +++ b/mm/vmalloc.c
> > @@ -363,7 +363,7 @@ retry:
> > }
> >
> > while (addr + size >= first->va_start && addr + size <= vend) {
> > - addr = ALIGN(first->va_end + PAGE_SIZE, align);
> > + addr = ALIGN(first->va_end, align);
> >
> > n = rb_next(&first->rb_node);
> > if (n)
> > --
> > 1.5.6.5
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0xf7c02000-0xf7c04000 8192 acpi_os_map_memory+0x11/0x1a phys=7fed1000 ioremap
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0xf7c0a000-0xf7c0c000 8192 acpi_os_map_memory+0x11/0x1a phys=7fef2000 ioremap
0xf7c0d000-0xf7c0f000 8192 __kvm_set_memory_region+0x164/0x355 [kvm] pages=1
vmalloc
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0xf7c24000-0xf7c27000 12288 acpi_os_map_memory+0x11/0x1a phys=7fef2000 ioremap
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0xf7c30000-0xf7c32000 8192 acpi_os_map_memory+0x11/0x1a phys=7fede000 ioremap
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0xf7c38000-0xf7c3a000 8192 acpi_os_map_memory+0x11/0x1a phys=7fed1000 ioremap
0xf7c3c000-0xf7c3e000 8192 acpi_os_map_memory+0x11/0x1a phys=7fede000 ioremap
0xf7c40000-0xf7c42000 8192 acpi_os_map_memory+0x11/0x1a phys=7fede000 ioremap
0xf7c44000-0xf7c46000 8192 acpi_os_map_memory+0x11/0x1a phys=7fede000 ioremap
0xf7c48000-0xf7c4a000 8192 acpi_os_map_memory+0x11/0x1a phys=7fede000 ioremap
0xf7c4b000-0xf7c57000 49152 zisofs_init+0xd/0x1c pages=11 vmalloc
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0xf7c67000-0xf7c71000 40960 vmalloc_exec+0x12/0x14 pages=9 vmalloc
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ioremap
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0xf7c87000-0xf7c89000 8192 __kvm_set_memory_region+0x1df/0x355 [kvm] pages=1
vmalloc
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0xf7c92000-0xf7c97000 20480 vmalloc_exec+0x12/0x14 pages=4 vmalloc
0xf7c9b000-0xf7c9f000 16384 vmalloc_exec+0x12/0x14 pages=3 vmalloc
0xf7ca0000-0xf7ca5000 20480 vmalloc_exec+0x12/0x14 pages=4 vmalloc
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0xf7cac000-0xf7caf000 12288 vmalloc_exec+0x12/0x14 pages=2 vmalloc
0xf7cb0000-0xf7cb2000 8192 iTCO_wdt_probe+0xbe/0x281 [iTCO_wdt]
phys=fed1f000 ioremap
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0xf7cc0000-0xf7cce000 57344 vmalloc_exec+0x12/0x14 pages=13 vmalloc
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0xf7cd3000-0xf7cd5000 8192 __kvm_set_memory_region+0x164/0x355 [kvm] pages=1
vmalloc
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0xf7cdd000-0xf7ce0000 12288 vmalloc_exec+0x12/0x14 pages=2 vmalloc
0xf7ce1000-0xf7ce4000 12288 vmalloc_exec+0x12/0x14 pages=2 vmalloc
0xf7ce6000-0xf7d02000 114688 vmalloc_exec+0x12/0x14 pages=27 vmalloc
0xf7d03000-0xf7d08000 20480 vmalloc_exec+0x12/0x14 pages=4 vmalloc
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vmalloc
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0xf7d13000-0xf7d24000 69632 snd_malloc_sgbuf_pages+0x190/0x1ca
[snd_page_alloc] vmap
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0xf7d2d000-0xf7d2f000 8192 dm_vcalloc+0x24/0x4c [dm_mod] pages=1 vmalloc
0xf7d30000-0xf7d50000 131072 vmalloc_exec+0x12/0x14 pages=31 vmalloc
0xf7d51000-0xf7d54000 12288 vmalloc_exec+0x12/0x14 pages=2 vmalloc
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0xf7d5b000-0xf7d5e000 12288 vmalloc_user+0x13/0x38 pages=2 vmalloc user
0xf7d5f000-0xf7d67000 32768 vmalloc_exec+0x12/0x14 pages=7 vmalloc
0xf7d68000-0xf7d79000 69632 snd_malloc_sgbuf_pages+0x190/0x1ca
[snd_page_alloc] vmap
0xf7d7a000-0xf7d86000 49152 vmalloc_exec+0x12/0x14 pages=11 vmalloc
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0xf7d8f000-0xf7d91000 8192 __kvm_set_memory_region+0x164/0x355 [kvm] pages=1
vmalloc
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vmalloc
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0xf7ddb000-0xf7dec000 69632 snd_malloc_sgbuf_pages+0x190/0x1ca
[snd_page_alloc] vmap
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0xf7e0f000-0xf7e23000 81920 vmalloc_exec+0x12/0x14 pages=19 vmalloc
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0xf7e46000-0xf7e68000 139264 vmalloc_exec+0x12/0x14 pages=33 vmalloc
0xf7e6d000-0xf7e6f000 8192 __kvm_set_memory_region+0x164/0x355 [kvm] pages=1
vmalloc
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ioremap
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0xf7f0f000-0xf7f28000 102400 vmalloc_exec+0x12/0x14 pages=24 vmalloc
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0xf7f3c000-0xf7f3e000 8192 __kvm_set_memory_region+0x1df/0x355 [kvm] pages=1
vmalloc
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vmalloc
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0xf803a000-0xf803c000 8192 __kvm_set_memory_region+0x1df/0x355 [kvm] pages=1
vmalloc
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vmalloc
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vmalloc
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vmalloc
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0xf8578000-0xf857d000 20480 azx_probe+0x32b/0xa0a [snd_hda_intel]
phys=ee400000 ioremap
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vmalloc
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ioremap
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vmalloc
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vmalloc
