e33c267ab7
Currently shrinkers are anonymous objects. For debugging purposes they
can be identified by count/scan function names, but it's not always
useful: e.g. for superblock's shrinkers it's nice to have at least an
idea of to which superblock the shrinker belongs.
This commit adds names to shrinkers. register_shrinker() and
prealloc_shrinker() functions are extended to take a format and arguments
to master a name.
In some cases it's not possible to determine a good name at the time when
a shrinker is allocated. For such cases shrinker_debugfs_rename() is
provided.
The expected format is:
<subsystem>-<shrinker_type>[:<instance>]-<id>
For some shrinkers an instance can be encoded as (MAJOR:MINOR) pair.
After this change the shrinker debugfs directory looks like:
$ cd /sys/kernel/debug/shrinker/
$ ls
dquota-cache-16 sb-devpts-28 sb-proc-47 sb-tmpfs-42
mm-shadow-18 sb-devtmpfs-5 sb-proc-48 sb-tmpfs-43
mm-zspool:zram0-34 sb-hugetlbfs-17 sb-pstore-31 sb-tmpfs-44
rcu-kfree-0 sb-hugetlbfs-33 sb-rootfs-2 sb-tmpfs-49
sb-aio-20 sb-iomem-12 sb-securityfs-6 sb-tracefs-13
sb-anon_inodefs-15 sb-mqueue-21 sb-selinuxfs-22 sb-xfs:vda1-36
sb-bdev-3 sb-nsfs-4 sb-sockfs-8 sb-zsmalloc-19
sb-bpf-32 sb-pipefs-14 sb-sysfs-26 thp-deferred_split-10
sb-btrfs:vda2-24 sb-proc-25 sb-tmpfs-1 thp-zero-9
sb-cgroup2-30 sb-proc-39 sb-tmpfs-27 xfs-buf:vda1-37
sb-configfs-23 sb-proc-41 sb-tmpfs-29 xfs-inodegc:vda1-38
sb-dax-11 sb-proc-45 sb-tmpfs-35
sb-debugfs-7 sb-proc-46 sb-tmpfs-40
[roman.gushchin@linux.dev: fix build warnings]
Link: https://lkml.kernel.org/r/Yr+ZTnLb9lJk6fJO@castle
Reported-by: kernel test robot <lkp@intel.com>
Link: https://lkml.kernel.org/r/20220601032227.4076670-4-roman.gushchin@linux.dev
Signed-off-by: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Cc: Dave Chinner <dchinner@redhat.com>
Cc: Hillf Danton <hdanton@sina.com>
Cc: Kent Overstreet <kent.overstreet@gmail.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
123 lines
3.0 KiB
C
123 lines
3.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (C) 2019 Arm Ltd.
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*
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* Based on msm_gem_freedreno.c:
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* Copyright (C) 2016 Red Hat
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* Author: Rob Clark <robdclark@gmail.com>
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*/
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#include <linux/list.h>
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#include <drm/drm_device.h>
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#include <drm/drm_gem_shmem_helper.h>
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#include "panfrost_device.h"
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#include "panfrost_gem.h"
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#include "panfrost_mmu.h"
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static unsigned long
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panfrost_gem_shrinker_count(struct shrinker *shrinker, struct shrink_control *sc)
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{
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struct panfrost_device *pfdev =
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container_of(shrinker, struct panfrost_device, shrinker);
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struct drm_gem_shmem_object *shmem;
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unsigned long count = 0;
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if (!mutex_trylock(&pfdev->shrinker_lock))
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return 0;
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list_for_each_entry(shmem, &pfdev->shrinker_list, madv_list) {
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if (drm_gem_shmem_is_purgeable(shmem))
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count += shmem->base.size >> PAGE_SHIFT;
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}
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mutex_unlock(&pfdev->shrinker_lock);
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return count;
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}
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static bool panfrost_gem_purge(struct drm_gem_object *obj)
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{
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struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
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struct panfrost_gem_object *bo = to_panfrost_bo(obj);
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bool ret = false;
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if (atomic_read(&bo->gpu_usecount))
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return false;
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if (!mutex_trylock(&bo->mappings.lock))
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return false;
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if (!mutex_trylock(&shmem->pages_lock))
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goto unlock_mappings;
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panfrost_gem_teardown_mappings_locked(bo);
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drm_gem_shmem_purge_locked(&bo->base);
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ret = true;
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mutex_unlock(&shmem->pages_lock);
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unlock_mappings:
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mutex_unlock(&bo->mappings.lock);
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return ret;
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}
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static unsigned long
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panfrost_gem_shrinker_scan(struct shrinker *shrinker, struct shrink_control *sc)
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{
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struct panfrost_device *pfdev =
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container_of(shrinker, struct panfrost_device, shrinker);
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struct drm_gem_shmem_object *shmem, *tmp;
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unsigned long freed = 0;
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if (!mutex_trylock(&pfdev->shrinker_lock))
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return SHRINK_STOP;
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list_for_each_entry_safe(shmem, tmp, &pfdev->shrinker_list, madv_list) {
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if (freed >= sc->nr_to_scan)
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break;
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if (drm_gem_shmem_is_purgeable(shmem) &&
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panfrost_gem_purge(&shmem->base)) {
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freed += shmem->base.size >> PAGE_SHIFT;
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list_del_init(&shmem->madv_list);
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}
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}
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mutex_unlock(&pfdev->shrinker_lock);
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if (freed > 0)
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pr_info_ratelimited("Purging %lu bytes\n", freed << PAGE_SHIFT);
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return freed;
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}
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/**
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* panfrost_gem_shrinker_init - Initialize panfrost shrinker
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* @dev: DRM device
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*
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* This function registers and sets up the panfrost shrinker.
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*/
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void panfrost_gem_shrinker_init(struct drm_device *dev)
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{
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struct panfrost_device *pfdev = dev->dev_private;
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pfdev->shrinker.count_objects = panfrost_gem_shrinker_count;
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pfdev->shrinker.scan_objects = panfrost_gem_shrinker_scan;
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pfdev->shrinker.seeks = DEFAULT_SEEKS;
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WARN_ON(register_shrinker(&pfdev->shrinker, "drm-panfrost"));
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}
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/**
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* panfrost_gem_shrinker_cleanup - Clean up panfrost shrinker
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* @dev: DRM device
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*
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* This function unregisters the panfrost shrinker.
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*/
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void panfrost_gem_shrinker_cleanup(struct drm_device *dev)
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{
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struct panfrost_device *pfdev = dev->dev_private;
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if (pfdev->shrinker.nr_deferred) {
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unregister_shrinker(&pfdev->shrinker);
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}
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}
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