141 lines
2.9 KiB
C
141 lines
2.9 KiB
C
/*
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* SPDX-License-Identifier: MIT
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*
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* Copyright © 2019 Intel Corporation
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*/
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#include <linux/slab.h>
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#include <linux/workqueue.h>
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#include "i915_active.h"
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#include "i915_gem_context.h"
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#include "i915_gem_object.h"
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#include "i915_globals.h"
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#include "i915_request.h"
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#include "i915_scheduler.h"
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#include "i915_vma.h"
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int __init i915_globals_init(void)
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{
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int err;
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err = i915_global_active_init();
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if (err)
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return err;
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err = i915_global_context_init();
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if (err)
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goto err_active;
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err = i915_global_objects_init();
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if (err)
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goto err_context;
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err = i915_global_request_init();
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if (err)
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goto err_objects;
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err = i915_global_scheduler_init();
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if (err)
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goto err_request;
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err = i915_global_vma_init();
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if (err)
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goto err_scheduler;
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return 0;
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err_scheduler:
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i915_global_scheduler_exit();
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err_request:
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i915_global_request_exit();
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err_objects:
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i915_global_objects_exit();
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err_context:
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i915_global_context_exit();
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err_active:
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i915_global_active_exit();
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return err;
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}
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static void i915_globals_shrink(void)
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{
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/*
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* kmem_cache_shrink() discards empty slabs and reorders partially
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* filled slabs to prioritise allocating from the mostly full slabs,
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* with the aim of reducing fragmentation.
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*/
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i915_global_active_shrink();
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i915_global_context_shrink();
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i915_global_objects_shrink();
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i915_global_request_shrink();
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i915_global_scheduler_shrink();
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i915_global_vma_shrink();
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}
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static atomic_t active;
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static atomic_t epoch;
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struct park_work {
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struct rcu_work work;
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int epoch;
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};
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static void __i915_globals_park(struct work_struct *work)
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{
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struct park_work *wrk = container_of(work, typeof(*wrk), work.work);
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/* Confirm nothing woke up in the last grace period */
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if (wrk->epoch == atomic_read(&epoch))
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i915_globals_shrink();
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kfree(wrk);
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}
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void i915_globals_park(void)
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{
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struct park_work *wrk;
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/*
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* Defer shrinking the global slab caches (and other work) until
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* after a RCU grace period has completed with no activity. This
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* is to try and reduce the latency impact on the consumers caused
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* by us shrinking the caches the same time as they are trying to
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* allocate, with the assumption being that if we idle long enough
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* for an RCU grace period to elapse since the last use, it is likely
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* to be longer until we need the caches again.
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*/
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if (!atomic_dec_and_test(&active))
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return;
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wrk = kmalloc(sizeof(*wrk), GFP_KERNEL);
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if (!wrk)
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return;
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wrk->epoch = atomic_inc_return(&epoch);
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INIT_RCU_WORK(&wrk->work, __i915_globals_park);
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queue_rcu_work(system_wq, &wrk->work);
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}
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void i915_globals_unpark(void)
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{
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atomic_inc(&epoch);
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atomic_inc(&active);
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}
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void __exit i915_globals_exit(void)
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{
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/* Flush any residual park_work */
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rcu_barrier();
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flush_scheduled_work();
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i915_global_vma_exit();
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i915_global_scheduler_exit();
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i915_global_request_exit();
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i915_global_objects_exit();
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i915_global_context_exit();
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i915_global_active_exit();
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/* And ensure that our DESTROY_BY_RCU slabs are truly destroyed */
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rcu_barrier();
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}
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