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authorJens Axboe <axboe@kernel.dk>2019-11-08 08:52:53 -0700
committerJens Axboe <axboe@kernel.dk>2019-11-11 16:32:55 -0700
commit0ddf92e848ab7abf216f218ee363eb9b9650e98f (patch)
tree795723a6285d9b89eb38d46298acf77d6fd8f8e0 /tools/perf/scripts/python/export-to-postgresql.py
parentio_uring: convert accept4() -ERESTARTSYS into -EINTR (diff)
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io_uring: provide fallback request for OOM situations
One thing that really sucks for userspace APIs is if the kernel passes back -ENOMEM/-EAGAIN for resource shortages. The application really has no idea of what to do in those cases. Should it try and reap completions? Probably a good idea. Will it solve the issue? Who knows. This patch adds a simple fallback mechanism if we fail to allocate memory for a request. If we fail allocating memory from the slab for a request, we punt to a pre-allocated request. There's just one of these per io_ring_ctx, but the important part is if we ever return -EBUSY to the application, the applications knows that it can wait for events and make forward progress when events have completed. This is the important part. Signed-off-by: Jens Axboe <axboe@kernel.dk>
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