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blkcg: BLKIO_STAT_CPU_SECTORS doesn't have subcounters
BLKIO_STAT_CPU_SECTORS doesn't need read/write/sync/async subcounters and is counted by blkio_group_stats_cpu->sectors; however, it still holds a member in blkio_group_stats_cpu->stat_arr_cpu. Rearrange stat_type_cpu and define BLKIO_STAT_CPU_ARR_NR and use it for stat_arr_cpu[] size so that only SERVICE_BYTES and SERVICED have subcounters. Signed-off-by: Tejun Heo <tj@kernel.org>
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@ -58,14 +58,17 @@ enum stat_type {
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/* Per cpu stats */
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enum stat_type_cpu {
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BLKIO_STAT_CPU_SECTORS,
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/* Total bytes transferred */
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BLKIO_STAT_CPU_SERVICE_BYTES,
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/* Total IOs serviced, post merge */
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BLKIO_STAT_CPU_SERVICED,
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BLKIO_STAT_CPU_NR
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/* All the single valued stats go below this */
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BLKIO_STAT_CPU_SECTORS,
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};
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#define BLKIO_STAT_CPU_ARR_NR (BLKIO_STAT_CPU_SERVICED + 1)
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enum stat_sub_type {
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BLKIO_STAT_READ = 0,
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BLKIO_STAT_WRITE,
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@ -167,7 +170,7 @@ struct blkio_group_stats {
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/* Per cpu blkio group stats */
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struct blkio_group_stats_cpu {
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uint64_t sectors;
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uint64_t stat_arr_cpu[BLKIO_STAT_CPU_NR][BLKIO_STAT_TOTAL];
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uint64_t stat_arr_cpu[BLKIO_STAT_CPU_ARR_NR][BLKIO_STAT_TOTAL];
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struct u64_stats_sync syncp;
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};
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