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Date: Tue, 3 Dec 2013 23:18:23 +0200 (EET) From: Meelis Roos <mroos@...ux.ee> To: Christoph Lameter <cl@...ux.com> cc: Pekka Enberg <penberg@...nel.org>, Matt Mackall <mpm@...enic.com>, Linux Kernel list <linux-kernel@...r.kernel.org>, linux-mm@...ck.org, Joonsoo Kim <js1304@...il.com> Subject: Re: Slab BUG with DEBUG_* options > I have another patch here (that I cannot test since I cannot run sparc > code) that simply changes the determination for switching slab management > to base the decision not on the final size of the slab (which is always > large in the debugging cases here) but on the initial object size. For > small objects < PAGESIZE/8 this should avoid the use of slab management > even in the debugging case. > > Subject: slab: Do not use slab management for slabs with smaller objects > > Use the object size to make the off slab decision instead of the final > size of the slab objects (which is large in case of > CONFIG_PAGEALLOC_DEBUG). Tested it. seems to hang after switching to another console. Before that, slabs are initialized successfully, I verified it with my previous debug printk sprinkle patch. Many allocations are still off slab - is that OK? Memory: 493968K/523456K available (3521K kernel code, 343K rwdata, 1176K rodata, 264K init, 9803K bss, 29488K reserved) __kmem_cache_create: starting, size=248, flags=8192 __kmem_cache_create: now flags=76800 __kmem_cache_create: aligned size to 248 because of redzoning __kmem_cache_create: pagealloc debug, setting size to 8192 __kmem_cache_create: aligned size to 8192 __kmem_cache_create: num=1, slab_size=64 __kmem_cache_create: starting, size=96, flags=8192 __kmem_cache_create: now flags=76800 __kmem_cache_create: aligned size to 96 because of redzoning __kmem_cache_create: pagealloc debug, setting size to 8192 __kmem_cache_create: aligned size to 8192 __kmem_cache_create: num=1, slab_size=64 __kmem_cache_create: starting, size=192, flags=8192 __kmem_cache_create: now flags=76800 __kmem_cache_create: aligned size to 192 because of redzoning __kmem_cache_create: pagealloc debug, setting size to 8192 __kmem_cache_create: aligned size to 8192 __kmem_cache_create: num=1, slab_size=64 __kmem_cache_create: starting, size=32, flags=8192 __kmem_cache_create: now flags=76800 __kmem_cache_create: aligned size to 32 because of redzoning __kmem_cache_create: aligned size to 32 __kmem_cache_create: num=226, slab_size=960 __kmem_cache_create: starting, size=64, flags=8192 __kmem_cache_create: now flags=76800 __kmem_cache_create: aligned size to 64 because of redzoning __kmem_cache_create: pagealloc debug, setting size to 8192 __kmem_cache_create: aligned size to 8192 __kmem_cache_create: num=1, slab_size=64 __kmem_cache_create: starting, size=128, flags=8192 __kmem_cache_create: now flags=76800 __kmem_cache_create: aligned size to 128 because of redzoning __kmem_cache_create: pagealloc debug, setting size to 8192 __kmem_cache_create: aligned size to 8192 __kmem_cache_create: num=1, slab_size=64 __kmem_cache_create: starting, size=256, flags=8192 __kmem_cache_create: now flags=76800 __kmem_cache_create: aligned size to 256 because of redzoning __kmem_cache_create: pagealloc debug, setting size to 8192 __kmem_cache_create: aligned size to 8192 __kmem_cache_create: num=1, slab_size=64 __kmem_cache_create: starting, size=512, flags=8192 __kmem_cache_create: now flags=76800 __kmem_cache_create: aligned size to 512 because of redzoning __kmem_cache_create: pagealloc debug, setting size to 8192 __kmem_cache_create: aligned size to 8192 __kmem_cache_create: num=1, slab_size=64 __kmem_cache_create: starting, size=1024, flags=8192 __kmem_cache_create: now flags=76800 __kmem_cache_create: aligned size to 1024 because of redzoning __kmem_cache_create: pagealloc debug, setting size to 8192 __kmem_cache_create: turning on CFLGS_OFF_SLAB, size=8192 __kmem_cache_create: aligned size to 8192 __kmem_cache_create: num=1, slab_size=64 __kmem_cache_create: CFLGS_OFF_SLAB, size=8192, slab_size=52 __kmem_cache_create: CFLGS_OFF_SLAB, allocating slab 52 __kmem_cache_create: starting, size=2048, flags=8192 __kmem_cache_create: now flags=76800 __kmem_cache_create: aligned size to 2048 because of redzoning __kmem_cache_create: pagealloc debug, setting size to 8192 __kmem_cache_create: turning on CFLGS_OFF_SLAB, size=8192 __kmem_cache_create: aligned size to 8192 __kmem_cache_create: num=1, slab_size=64 __kmem_cache_create: CFLGS_OFF_SLAB, size=8192, slab_size=52 __kmem_cache_create: CFLGS_OFF_SLAB, allocating slab 52 __kmem_cache_create: starting, size=4096, flags=8192 __kmem_cache_create: now flags=10240 __kmem_cache_create: pagealloc debug, setting size to 8192 __kmem_cache_create: turning on CFLGS_OFF_SLAB, size=8192 __kmem_cache_create: aligned size to 8192 __kmem_cache_create: num=1, slab_size=64 __kmem_cache_create: CFLGS_OFF_SLAB, size=8192, slab_size=52 __kmem_cache_create: CFLGS_OFF_SLAB, allocating slab 52 __kmem_cache_create: starting, size=8192, flags=8192 __kmem_cache_create: now flags=10240 __kmem_cache_create: turning on CFLGS_OFF_SLAB, size=8192 __kmem_cache_create: aligned size to 8192 __kmem_cache_create: num=1, slab_size=64 __kmem_cache_create: CFLGS_OFF_SLAB, size=8192, slab_size=52 __kmem_cache_create: CFLGS_OFF_SLAB, allocating slab 52 __kmem_cache_create: starting, size=16384, flags=8192 __kmem_cache_create: now flags=10240 __kmem_cache_create: turning on CFLGS_OFF_SLAB, size=16384 __kmem_cache_create: aligned size to 16384 __kmem_cache_create: num=1, slab_size=64 __kmem_cache_create: CFLGS_OFF_SLAB, size=16384, slab_size=52 __kmem_cache_create: CFLGS_OFF_SLAB, allocating slab 52 __kmem_cache_create: starting, size=32768, flags=8192 __kmem_cache_create: now flags=10240 __kmem_cache_create: turning on CFLGS_OFF_SLAB, size=32768 __kmem_cache_create: aligned size to 32768 __kmem_cache_create: num=1, slab_size=64 __kmem_cache_create: CFLGS_OFF_SLAB, size=32768, slab_size=52 __kmem_cache_create: CFLGS_OFF_SLAB, allocating slab 52 __kmem_cache_create: starting, size=65536, flags=8192 __kmem_cache_create: now flags=10240 __kmem_cache_create: turning on CFLGS_OFF_SLAB, size=65536 __kmem_cache_create: aligned size to 65536 __kmem_cache_create: num=1, slab_size=64 __kmem_cache_create: CFLGS_OFF_SLAB, size=65536, slab_size=52 __kmem_cache_create: CFLGS_OFF_SLAB, allocating slab 52 __kmem_cache_create: starting, size=131072, flags=8192 __kmem_cache_create: now flags=10240 __kmem_cache_create: turning on CFLGS_OFF_SLAB, size=131072 __kmem_cache_create: aligned size to 131072 __kmem_cache_create: num=1, slab_size=64 __kmem_cache_create: CFLGS_OFF_SLAB, size=131072, slab_size=52 __kmem_cache_create: CFLGS_OFF_SLAB, allocating slab 52 __kmem_cache_create: starting, size=262144, flags=8192 __kmem_cache_create: now flags=10240 __kmem_cache_create: turning on CFLGS_OFF_SLAB, size=262144 __kmem_cache_create: aligned size to 262144 __kmem_cache_create: num=1, slab_size=64 __kmem_cache_create: CFLGS_OFF_SLAB, size=262144, slab_size=52 __kmem_cache_create: CFLGS_OFF_SLAB, allocating slab 52 __kmem_cache_create: starting, size=524288, flags=8192 __kmem_cache_create: now flags=10240 __kmem_cache_create: turning on CFLGS_OFF_SLAB, size=524288 __kmem_cache_create: aligned size to 524288 __kmem_cache_create: num=1, slab_size=64 __kmem_cache_create: CFLGS_OFF_SLAB, size=524288, slab_size=52 __kmem_cache_create: CFLGS_OFF_SLAB, allocating slab 52 __kmem_cache_create: starting, size=1048576, flags=8192 __kmem_cache_create: now flags=10240 __kmem_cache_create: turning on CFLGS_OFF_SLAB, size=1048576 __kmem_cache_create: aligned size to 1048576 __kmem_cache_create: num=1, slab_size=64 __kmem_cache_create: CFLGS_OFF_SLAB, size=1048576, slab_size=52 __kmem_cache_create: CFLGS_OFF_SLAB, allocating slab 52 __kmem_cache_create: starting, size=2097152, flags=8192 __kmem_cache_create: now flags=10240 __kmem_cache_create: turning on CFLGS_OFF_SLAB, size=2097152 __kmem_cache_create: aligned size to 2097152 __kmem_cache_create: num=1, slab_size=64 __kmem_cache_create: CFLGS_OFF_SLAB, size=2097152, slab_size=52 __kmem_cache_create: CFLGS_OFF_SLAB, allocating slab 52 __kmem_cache_create: starting, size=4194304, flags=8192 __kmem_cache_create: now flags=10240 __kmem_cache_create: turning on CFLGS_OFF_SLAB, size=4194304 __kmem_cache_create: aligned size to 4194304 __kmem_cache_create: num=1, slab_size=64 __kmem_cache_create: CFLGS_OFF_SLAB, size=4194304, slab_size=52 __kmem_cache_create: CFLGS_OFF_SLAB, allocating slab 52 __kmem_cache_create: starting, size=8388608, flags=8192 __kmem_cache_create: now flags=10240 __kmem_cache_create: turning on CFLGS_OFF_SLAB, size=8388608 __kmem_cache_create: aligned size to 8388608 __kmem_cache_create: num=1, slab_size=64 __kmem_cache_create: CFLGS_OFF_SLAB, size=8388608, slab_size=52 __kmem_cache_create: CFLGS_OFF_SLAB, allocating slab 52 __kmem_cache_create: starting, size=8192, flags=0 __kmem_cache_create: now flags=2048 __kmem_cache_create: turning on CFLGS_OFF_SLAB, size=8192 __kmem_cache_create: aligned size to 8192 __kmem_cache_create: num=1, slab_size=8192 __kmem_cache_create: CFLGS_OFF_SLAB, size=8192, slab_size=52 __kmem_cache_create: CFLGS_OFF_SLAB, allocating slab 52 __kmem_cache_create: starting, size=8192, flags=0 __kmem_cache_create: now flags=2048 __kmem_cache_create: turning on CFLGS_OFF_SLAB, size=8192 __kmem_cache_create: aligned size to 8192 __kmem_cache_create: num=1, slab_size=8192 __kmem_cache_create: CFLGS_OFF_SLAB, size=8192, slab_size=52 __kmem_cache_create: CFLGS_OFF_SLAB, allocating slab 52 __kmem_cache_create: starting, size=16384, flags=0 __kmem_cache_create: now flags=2048 __kmem_cache_create: turning on CFLGS_OFF_SLAB, size=16384 __kmem_cache_create: aligned size to 16384 __kmem_cache_create: num=1, slab_size=16384 __kmem_cache_create: CFLGS_OFF_SLAB, size=16384, slab_size=52 __kmem_cache_create: CFLGS_OFF_SLAB, allocating slab 52 __kmem_cache_create: starting, size=32768, flags=0 __kmem_cache_create: now flags=2048 __kmem_cache_create: turning on CFLGS_OFF_SLAB, size=32768 __kmem_cache_create: aligned size to 32768 __kmem_cache_create: num=1, slab_size=32768 __kmem_cache_create: CFLGS_OFF_SLAB, size=32768, slab_size=52 __kmem_cache_create: CFLGS_OFF_SLAB, allocating slab 52 __kmem_cache_create: starting, size=65536, flags=0 __kmem_cache_create: now flags=2048 __kmem_cache_create: turning on CFLGS_OFF_SLAB, size=65536 __kmem_cache_create: aligned size to 65536 __kmem_cache_create: num=1, slab_size=65536 __kmem_cache_create: CFLGS_OFF_SLAB, size=65536, slab_size=52 __kmem_cache_create: CFLGS_OFF_SLAB, allocating slab 52 __kmem_cache_create: starting, size=131072, flags=0 __kmem_cache_create: now flags=2048 __kmem_cache_create: turning on CFLGS_OFF_SLAB, size=131072 __kmem_cache_create: aligned size to 131072 __kmem_cache_create: num=1, slab_size=131072 __kmem_cache_create: CFLGS_OFF_SLAB, size=131072, slab_size=52 __kmem_cache_create: CFLGS_OFF_SLAB, allocating slab 52 __kmem_cache_create: starting, size=262144, flags=0 __kmem_cache_create: now flags=2048 __kmem_cache_create: turning on CFLGS_OFF_SLAB, size=262144 __kmem_cache_create: aligned size to 262144 __kmem_cache_create: num=1, slab_size=262144 __kmem_cache_create: CFLGS_OFF_SLAB, size=262144, slab_size=52 __kmem_cache_create: CFLGS_OFF_SLAB, allocating slab 52 __kmem_cache_create: starting, size=524288, flags=0 __kmem_cache_create: now flags=2048 __kmem_cache_create: turning on CFLGS_OFF_SLAB, size=524288 __kmem_cache_create: aligned size to 524288 __kmem_cache_create: num=1, slab_size=524288 __kmem_cache_create: CFLGS_OFF_SLAB, size=524288, slab_size=52 __kmem_cache_create: CFLGS_OFF_SLAB, allocating slab 52 __kmem_cache_create: starting, size=1048576, flags=0 __kmem_cache_create: now flags=2048 __kmem_cache_create: turning on CFLGS_OFF_SLAB, size=1048576 __kmem_cache_create: aligned size to 1048576 __kmem_cache_create: num=1, slab_size=1048576 __kmem_cache_create: CFLGS_OFF_SLAB, size=1048576, slab_size=52 __kmem_cache_create: CFLGS_OFF_SLAB, allocating slab 52 __kmem_cache_create: starting, size=2112, flags=262144 __kmem_cache_create: now flags=330752 __kmem_cache_create: aligned size to 2112 because of redzoning __kmem_cache_create: aligned size to 2128 because of redzoning, take 2 __kmem_cache_create: increased size to 2136 because user store and redzoning __kmem_cache_create: pagealloc debug, setting size to 8192 __kmem_cache_create: turning on CFLGS_OFF_SLAB, size=8192 __kmem_cache_create: aligned size to 8192 __kmem_cache_create: num=1, slab_size=56 __kmem_cache_create: CFLGS_OFF_SLAB, size=8192, slab_size=52 __kmem_cache_create: CFLGS_OFF_SLAB, allocating slab 52 __kmem_cache_create: starting, size=560, flags=393216 __kmem_cache_create: now flags=461824 __kmem_cache_create: aligned size to 560 because of redzoning __kmem_cache_create: aligned size to 576 because of redzoning, take 2 __kmem_cache_create: increased size to 584 because user store and redzoning __kmem_cache_create: pagealloc debug, setting size to 8192 __kmem_cache_create: aligned size to 8192 __kmem_cache_create: num=1, slab_size=56 NR_IRQS:255 kmemleak: Kernel memory leak detector disabled clocksource: mult[2c71c72] shift[24] clockevent: mult[5c28f5c3] shift[32] Console: colour dummy device 80x25 console [tty0] enabled, bootconsole disabled -- Meelis Roos (mroos@...ux.ee) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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