6 Commits

Author	SHA1	Message	Date
Francesco Mazzoli	9112cac1b0	si_mem_available() returns the _pages_ available, not bytes	2023-05-26 17:22:43 +00:00
Francesco Mazzoli	1a701f22a2	Actually reclaim spans	2023-05-25 10:22:31 +00:00
Francesco Mazzoli	52e50a1888	Simplify span cache locking further ... With seqcount with the current locking strategy we can get into subtle nasty situations. For now, just be "dumb" with a rw semaphore. For example, consider the case where we get the span in the seqcount protected section in get_span. Between getting the span and acquiring it the reclaimer might free it. Ideally we'd do something similar to what Paweł planned (seqcount and RCU protection) but let's start with something simple which seems to work. Also, shard the LRU by 128, to reduce contention, and fix a couple of unrelated bugs.	2023-05-25 08:34:40 +00:00
Francesco Mazzoli	47c1022896	Bugfixes	2023-05-23 22:10:11 +00:00
Francesco Mazzoli	8f32ecc1b6	Cached spans reclamation ... Right now this is very crude (global spinlock), but reasonably simple. We can improve if needed.	2023-05-23 16:57:29 +00:00
Francesco Mazzoli	6addbdee6a	First version of kernel module ... Initial version really by Pawel, but many changes in between. Big outstanding issues: * span cache reclamation (unbounded memory otherwise...) * bad block service detection and workarounds * corrupted blocks detection and workaround Co-authored-by: Paweł Dziepak <pawel.dziepak@xtxmarkets.com>	2023-05-18 15:29:41 +00:00