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9ff885ef8b
Current GT statistics use atomic64_t counters. Atomic operations incur a global coherency penalty. Transition to dynamic per-cpu counters using alloc_percpu(). This allows stats to be incremented via this_cpu_add(), which compiles to a single non-locking instruction. This approach keeps the hot-path updates local to the CPU, avoiding expensive cross-core cache invalidation traffic. Use for_each_possible_cpu() during aggregation and clear operations to ensure data consistency across CPU hotplug events. Signed-off-by: Matthew Brost <matthew.brost@intel.com> Reviewed-by: Stuart Summers <stuart.summers@intel.com> Link: https://patch.msgid.link/20260217200552.596718-1-matthew.brost@intel.com
65 lines
1.4 KiB
C
65 lines
1.4 KiB
C
/* SPDX-License-Identifier: MIT */
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/*
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* Copyright © 2024 Intel Corporation
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*/
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#ifndef _XE_GT_STATS_H_
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#define _XE_GT_STATS_H_
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#include <linux/ktime.h>
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#include "xe_gt_stats_types.h"
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struct xe_gt;
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struct drm_printer;
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#ifdef CONFIG_DEBUG_FS
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int xe_gt_stats_init(struct xe_gt *gt);
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int xe_gt_stats_print_info(struct xe_gt *gt, struct drm_printer *p);
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void xe_gt_stats_clear(struct xe_gt *gt);
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void xe_gt_stats_incr(struct xe_gt *gt, const enum xe_gt_stats_id id, int incr);
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#else
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static inline int xe_gt_stats_init(struct xe_gt *gt)
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{
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return 0;
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}
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static inline void
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xe_gt_stats_incr(struct xe_gt *gt, const enum xe_gt_stats_id id,
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int incr)
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{
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}
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#endif
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/**
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* xe_gt_stats_ktime_us_delta() - Get delta in microseconds between now and a
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* start time
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* @start: Start time
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*
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* Helper for GT stats to get delta in microseconds between now and a start
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* time, compiles out if GT stats are disabled.
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*
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* Return: Delta in microseconds between now and a start time
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*/
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static inline s64 xe_gt_stats_ktime_us_delta(ktime_t start)
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{
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return IS_ENABLED(CONFIG_DEBUG_FS) ?
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ktime_us_delta(ktime_get(), start) : 0;
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}
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/**
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* xe_gt_stats_ktime_get() - Get current ktime
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*
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* Helper for GT stats to get current ktime, compiles out if GT stats are
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* disabled.
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*
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* Return: Get current ktime
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*/
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static inline ktime_t xe_gt_stats_ktime_get(void)
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{
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return IS_ENABLED(CONFIG_DEBUG_FS) ? ktime_get() : 0;
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}
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#endif
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