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cfq: calculate the seek_mean per cfq_queue not per cfq_io_context

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async cfq_queue's are already shared between processes within the same
priority, and forthcoming patches will change the mapping of cic to sync
cfq_queue from 1:1 to 1:N.  So, calculate the seekiness of a process
based on the cfq_queue instead of the cfq_io_context.

Signed-off-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Jeff Moyer 2009-10-23 17:14:49 -04:00 • committed by Jens Axboe
parent c30f33437c
commit b2c18e1e08
2 changed files with 33 additions and 40 deletions
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5
include/linux/iocontext.h
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@ -40,16 +40,11 @@ struct cfq_io_context {
struct io_context *ioc;
unsigned long last_end_request;
sector_t last_request_pos;
unsigned long ttime_total;
unsigned long ttime_samples;
unsigned long ttime_mean;
unsigned int seek_samples;
u64 seek_total;
sector_t seek_mean;
struct list_head queue_list;
struct hlist_node cic_list;