On Tue, 15 May 2007, Peter Zijlstra wrote:
> How about something like this; it seems to sustain a little stress.
Argh again mods to kmem_cache.
Could we do this with a new slab page flag? F.e. SlabEmergPool.
in alloc_slab() do
if (is_emergency_pool_page(page)) {
SetSlabDebug(page);
SetSlabEmerg(page);
}
So now you can intercept allocs to the SlabEmerg slab in __slab_alloc
debug:
if (SlabEmergPool(page)) {
if (mem_no_longer_critical()) {
/* Avoid future trapping */
ClearSlabDebug(page);
ClearSlabEmergPool(page);
} else
if (process_not_allowed_this_memory()) {
do_something_bad_to_the_caller();
} else {
/* Allocation permitted */
}
}
....
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