On Mon, Feb 10, 2014 at 02:15:14PM +0100, Josep Lladonosa wrote: > On 10 February 2014 12:40, Gabriel de Perthuis <g2p.code@xxxxxxxxx> wrote: > >> Hello, > >> > >> I am using bcache in my laptop (RAM 32 GiB). I have been using it > >> perfectly for a month. ext4 + bcache. > >> > >> Yesterday, system did not want do to a normal startup. Messages where > >> from udev out of memory (and udevadm killed?) and system was not > >> mounting / (/dev/bcache0). > >> > >> [ 6.823222] bcache-register invoked oom-killer: gfp_mask=0x82d2, > >> order=0, oom_score_adj=0 > > > > Build your kernel with CONFIG_COMPACTION. I've added it to the FAQ: > > http://bcache.evilpiepirate.org/~kent/bcache/FAQ/ > > > Hello Gabriel, > > Thanks for your reply. > > My .config file has already: > ... > CONFIG_COMPACTION=y I looked at the allocations done in bcache_device_init(), those aren't high order page allocations (they're vmalloc allocations) so compaction won't help here. > ... > > I have been digging around to find information and sometimes bugs come > related to unsigned variables and their operations when storing large > numbers (reserved memory?). Kernel is 64 bits. Memory is 32 GiB. > Perhaps it could happen that the allocated memory is not totally > freed. > > When kernel has been able to boot with 32 GiB (having bcache0 messed > up and bcache1 mountable), it seems that bcache has more than 16 GiB > allocated and kept. Woah, really? If so that's bad - I don't see how that follows (or am I misreading) from your numbers, can you show a before and after when you bring bcache up? > > -Free memory with kernel 3.11.0-rc7 with 32GiB and bcache0 (halved?) > and bcache1 (mounted) > > $ head -2 /proc/meminfo > MemTotal: 32913872 kB > MemFree: 12376640 kB > > > - Free memory with kernel 3.12.9 with mem=16G and bcache0 (mounted) > > $ head -2 /proc/meminfo > MemTotal: 15602144 kB > MemFree: 14005372 kB > > > > > > > > > -- > > To unsubscribe from this list: send the line "unsubscribe linux-bcache" in > > the body of a message to majordomo@xxxxxxxxxxxxxxx > > More majordomo info at http://vger.kernel.org/majordomo-info.html > > > > -- > -- > Salutacions...Josep > -- > -- > To unsubscribe from this list: send the line "unsubscribe linux-bcache" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-bcache" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
