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7169b727ea
In the spirit of what we are doing for the read semaphore, this patch moves system writes to its own dirty memory manager. Not only will it make sure that system tables will not be serialized by its own semaphore, but it will also put system tables in its own region group. Moving system tables to its own region group has the advantage that system requests won't be waiting during throttle behind a potentially big queue of user requests, since requests are tended to in FIFO order within the same region group. However, system tables being more controlled and predictable, we can actually go a step further and give them some extra reservation so they may not necessarily block even if under pressure (up to 10 MB more). Signed-off-by: Glauber Costa <glauber@scylladb.com>