082cf69eb8
Currently we cap request allocations at q->nr_requests, but we allow a batching io context to allocate up to 32 more (default setting). This can flood the queue with request allocations, with only a few batching processes. The real fix would be to limit the number of batchers, but as that isn't currently tracked, I suggest we just cap the maximum number of allocated requests to eg 50% over the limit. This was observed in real life, users typically see this as vmstat bo numbers going off the wall with seconds of no queueing afterwards. Behaviour this bursty is not beneficial. Signed-off-by: Jens Axboe <axboe@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org> |
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| .. | ||
| aoe | ||
| paride | ||
| DAC960.c | ||
| DAC960.h | ||
| Kconfig | ||
| Kconfig.iosched | ||
| Makefile | ||
| acsi.c | ||
| acsi_slm.c | ||
| amiflop.c | ||
| as-iosched.c | ||
| ataflop.c | ||
| cciss.c | ||
| cciss.h | ||
| cciss_cmd.h | ||
| cciss_scsi.c | ||
| cciss_scsi.h | ||
| cfq-iosched.c | ||
| cpqarray.c | ||
| cpqarray.h | ||
| cryptoloop.c | ||
| deadline-iosched.c | ||
| elevator.c | ||
| floppy.c | ||
| genhd.c | ||
| ida_cmd.h | ||
| ida_ioctl.h | ||
| ioctl.c | ||
| ll_rw_blk.c | ||
| loop.c | ||
| nbd.c | ||
| noop-iosched.c | ||
| pktcdvd.c | ||
| ps2esdi.c | ||
| rd.c | ||
| scsi_ioctl.c | ||
| smart1,2.h | ||
| swim3.c | ||
| swim_iop.c | ||
| sx8.c | ||
| ub.c | ||
| umem.c | ||
| viodasd.c | ||
| xd.c | ||
| xd.h | ||
| z2ram.c | ||