On 3/3/20 10:42 AM, Greg Kroah-Hartman wrote: > From: Coly Li <colyli@xxxxxxx> > > [ Upstream commit 0b96da639a4874311e9b5156405f69ef9fc3bef8 ] > > When run a cache set, all the bcache btree node of this cache set will > be checked by bch_btree_check(). If the bcache btree is very large, > iterating all the btree nodes will occupy too much system memory and > the bcache registering process might be selected and killed by system > OOM killer. kthread_run() will fail if current process has pending > signal, therefore the kthread creating in run_cache_set() for gc and > allocator kernel threads are very probably failed for a very large > bcache btree. > > Indeed such OOM is safe and the registering process will exit after > the registration done. Therefore this patch flushes pending signals > during the cache set start up, specificly in bch_cache_allocator_start() > and bch_gc_thread_start(), to make sure run_cache_set() won't fail for > large cahced data set. Please drop this one, it's being reverted in mainline. -- Jens Axboe
