Revision 1fb9341ac34825aa40354e74d9a2c69df7d2c304 authored by Rusty Russell on 12 January 2013, 02:57:34 UTC, committed by Rusty Russell on 12 January 2013, 02:57:46 UTC
Prarit's excellent bug report: > In recent Fedora releases (F17 & F18) some users have reported seeing > messages similar to > > [ 15.478160] kvm: Could not allocate 304 bytes percpu data > [ 15.478174] PERCPU: allocation failed, size=304 align=32, alloc from > reserved chunk failed > > during system boot. In some cases, users have also reported seeing this > message along with a failed load of other modules. > > What is happening is systemd is loading an instance of the kvm module for > each cpu found (see commit e9bda3b). When the module load occurs the kernel > currently allocates the modules percpu data area prior to checking to see > if the module is already loaded or is in the process of being loaded. If > the module is already loaded, or finishes load, the module loading code > releases the current instance's module's percpu data. Now we have a new state MODULE_STATE_UNFORMED, we can insert the module into the list (and thus guarantee its uniqueness) before we allocate the per-cpu region. Reported-by: Prarit Bhargava <prarit@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Tested-by: Prarit Bhargava <prarit@redhat.com>
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File | Mode | Size |
---|---|---|
partitions | ||
Kconfig | -rw-r--r-- | 3.3 KB |
Kconfig.iosched | -rw-r--r-- | 1.6 KB |
Makefile | -rw-r--r-- | 720 bytes |
blk-cgroup.c | -rw-r--r-- | 24.2 KB |
blk-cgroup.h | -rw-r--r-- | 13.6 KB |
blk-core.c | -rw-r--r-- | 82.1 KB |
blk-exec.c | -rw-r--r-- | 3.2 KB |
blk-flush.c | -rw-r--r-- | 13.1 KB |
blk-integrity.c | -rw-r--r-- | 11.5 KB |
blk-ioc.c | -rw-r--r-- | 10.2 KB |
blk-iopoll.c | -rw-r--r-- | 5.9 KB |
blk-lib.c | -rw-r--r-- | 7.1 KB |
blk-map.c | -rw-r--r-- | 8.2 KB |
blk-merge.c | -rw-r--r-- | 12.7 KB |
blk-settings.c | -rw-r--r-- | 26.3 KB |
blk-softirq.c | -rw-r--r-- | 4.5 KB |
blk-sysfs.c | -rw-r--r-- | 15.5 KB |
blk-tag.c | -rw-r--r-- | 9.7 KB |
blk-throttle.c | -rw-r--r-- | 30.8 KB |
blk-timeout.c | -rw-r--r-- | 4.7 KB |
blk.h | -rw-r--r-- | 7.1 KB |
bsg-lib.c | -rw-r--r-- | 6.0 KB |
bsg.c | -rw-r--r-- | 23.7 KB |
cfq-iosched.c | -rw-r--r-- | 108.2 KB |
compat_ioctl.c | -rw-r--r-- | 20.8 KB |
deadline-iosched.c | -rw-r--r-- | 11.1 KB |
elevator.c | -rw-r--r-- | 23.2 KB |
genhd.c | -rw-r--r-- | 43.3 KB |
ioctl.c | -rw-r--r-- | 10.7 KB |
noop-iosched.c | -rw-r--r-- | 2.5 KB |
partition-generic.c | -rw-r--r-- | 14.0 KB |
scsi_ioctl.c | -rw-r--r-- | 19.6 KB |
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