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0ce51dc93b
The buffer reserve set by tune.buffers.reserve has long been unused, and in order to deal gracefully with failed memory allocations we'll need to resort to a few emergency buffers that are pre-allocated per thread. These buffers are only for emergency use, so every time their count is below the configured number a b_free() will refill them. For this reason their count can remain pretty low. We changed the default number from 2 to 4 per thread, and the minimum value is now zero (e.g. for low-memory systems). The tune.buffers.limit setting has always been a problem when trying to deal with the reserve but now we could simplify it by simply pushing the limit (if set) to match the reserve. That was already done in the past with a static value, but now with threads it was a bit trickier, which is why the per-thread allocators increment the limit on the fly before allocating their own buffers. This also means that the configured limit is saner and now corresponds to the regular buffers that can be allocated on top of emergency buffers. At the moment these emergency buffers are not used upon allocation failure. The only reason is to ease bisecting later if needed, since this commit only has to deal with resource management. |
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