On 08/04/2017 01:14 PM, Pradeep wrote:
Hello,I'm hitting a case where mdcache keeps growing well beyond the high water mark. Here is a snapshot of the lru_state: 1 = {entries_hiwat = 100000, entries_used = 2306063, chunks_hiwat = 100000, chunks_used = 16462, It has grown to 2.3 million entries and each entry is ~1.6K. I looked at the first entry in lane 0, L1 queue: (gdb) p LRU[0].L1 $9 = {q = {next = 0x7fad64256f00, prev = 0x7faf21a1bc00}, id = LRU_ENTRY_L1, size = 254628} (gdb) p (mdcache_entry_t *)(0x7fad64256f00-1024) $10 = (mdcache_entry_t *) 0x7fad64256b00 (gdb) p $10->lru $11 = {q = {next = 0x7fad65ea0f00, prev = 0x7d67c0 <LRU>}, qid = LRU_ENTRY_L1, refcnt = 2, flags = 0, lane = 0, cf = 0} (gdb) p $10->fh_hk.inavl $13 = true Lane 1: (gdb) p LRU[1].L1 $18 = {q = {next = 0x7fad625c0300, prev = 0x7faec08c5100}, id = LRU_ENTRY_L1, size = 253006} (gdb) p (mdcache_entry_t *)(0x7fad625c0300 - 1024) $21 = (mdcache_entry_t *) 0x7fad625bff00 (gdb) p $21->lru $22 = {q = {next = 0x7fad66fce600, prev = 0x7d68a0 <LRU+224>}, qid = LRU_ENTRY_L1, refcnt = 2, flags = 0, lane = 1, cf = 1} (gdb) p $21->fh_hk.inavl $24 = true As per LRU_ENTRY_RECLAIMABLE(), these entry should be reclaimable. Not sure why it is not able to claim it. Any ideas?
refcnt == 2 is not reclaimable. Reclaimable is refcnt == 1. It checks for 2 because it just took a ref. Unless you're actually processing that lane, and so seeing the ref taken during that processing, refcnt will be 3 when processing, and it won't be reclaimed.
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