From: Xie Yongji <xieyongji@bytedance.com>
To: mst@redhat.com, jasowang@redhat.com, stefanha@redhat.com,
sgarzare@redhat.com, parav@nvidia.com, akpm@linux-foundation.org,
rdunlap@infradead.org, willy@infradead.org,
viro@zeniv.linux.org.uk, axboe@kernel.dk, bcrl@kvack.org,
corbet@lwn.net
Cc: virtualization@lists.linux-foundation.org,
netdev@vger.kernel.org, kvm@vger.kernel.org, linux-aio@kvack.org,
linux-fsdevel@vger.kernel.org, linux-mm@kvack.org
Subject: [RFC v2 12/13] vduse: Add memory shrinker to reclaim bounce pages
Date: Tue, 22 Dec 2020 22:52:20 +0800 [thread overview]
Message-ID: <20201222145221.711-13-xieyongji@bytedance.com> (raw)
In-Reply-To: <20201222145221.711-1-xieyongji@bytedance.com>
Add a shrinker to reclaim several pages used by bounce buffer
in order to avoid memory pressures.
Signed-off-by: Xie Yongji <xieyongji@bytedance.com>
---
drivers/vdpa/vdpa_user/vduse_dev.c | 51 ++++++++++++++++++++++++++++++++++++++
1 file changed, 51 insertions(+)
diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c
index c29b24a7e7e9..1bc2e627c476 100644
--- a/drivers/vdpa/vdpa_user/vduse_dev.c
+++ b/drivers/vdpa/vdpa_user/vduse_dev.c
@@ -1142,6 +1142,43 @@ static long vduse_ioctl(struct file *file, unsigned int cmd,
return ret;
}
+static unsigned long vduse_shrink_scan(struct shrinker *shrinker,
+ struct shrink_control *sc)
+{
+ unsigned long freed = 0;
+ struct vduse_dev *dev;
+
+ if (!mutex_trylock(&vduse_lock))
+ return SHRINK_STOP;
+
+ list_for_each_entry(dev, &vduse_devs, list) {
+ if (!dev->domain)
+ continue;
+
+ freed = vduse_domain_reclaim(dev->domain);
+ if (!freed)
+ continue;
+
+ list_move_tail(&dev->list, &vduse_devs);
+ break;
+ }
+ mutex_unlock(&vduse_lock);
+
+ return freed ? freed : SHRINK_STOP;
+}
+
+static unsigned long vduse_shrink_count(struct shrinker *shrink,
+ struct shrink_control *sc)
+{
+ return percpu_counter_read_positive(&vduse_total_bounce_pages);
+}
+
+static struct shrinker vduse_bounce_pages_shrinker = {
+ .count_objects = vduse_shrink_count,
+ .scan_objects = vduse_shrink_scan,
+ .seeks = DEFAULT_SEEKS,
+};
+
static const struct file_operations vduse_fops = {
.owner = THIS_MODULE,
.unlocked_ioctl = vduse_ioctl,
@@ -1292,12 +1329,24 @@ static int vduse_init(void)
if (ret)
goto err_irqfd;
+ ret = vduse_domain_init();
+ if (ret)
+ goto err_domain;
+
+ ret = register_shrinker(&vduse_bounce_pages_shrinker);
+ if (ret)
+ goto err_shrinker;
+
ret = vduse_parentdev_init();
if (ret)
goto err_parentdev;
return 0;
err_parentdev:
+ unregister_shrinker(&vduse_bounce_pages_shrinker);
+err_shrinker:
+ vduse_domain_exit();
+err_domain:
vduse_virqfd_exit();
err_irqfd:
destroy_workqueue(vduse_vdpa_wq);
@@ -1309,8 +1358,10 @@ module_init(vduse_init);
static void vduse_exit(void)
{
+ unregister_shrinker(&vduse_bounce_pages_shrinker);
misc_deregister(&vduse_misc);
destroy_workqueue(vduse_vdpa_wq);
+ vduse_domain_exit();
vduse_virqfd_exit();
vduse_parentdev_exit();
}
--
2.11.0
next prev parent reply other threads:[~2020-12-22 14:55 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-22 14:52 [RFC v2 00/13] Introduce VDUSE - vDPA Device in Userspace Xie Yongji
2020-12-22 14:52 ` [RFC v2 01/13] mm: export zap_page_range() for driver use Xie Yongji
2020-12-22 15:44 ` Christoph Hellwig
2020-12-22 14:52 ` [RFC v2 02/13] eventfd: track eventfd_signal() recursion depth separately in different cases Xie Yongji
2020-12-22 14:52 ` [RFC v2 03/13] eventfd: Increase the recursion depth of eventfd_signal() Xie Yongji
2020-12-22 14:52 ` [RFC v2 04/13] vdpa: Remove the restriction that only supports virtio-net devices Xie Yongji
2020-12-22 14:52 ` [RFC v2 05/13] vdpa: Pass the netlink attributes to ops.dev_add() Xie Yongji
2020-12-22 14:52 ` [RFC v2 06/13] vduse: Introduce VDUSE - vDPA Device in Userspace Xie Yongji
2020-12-23 8:08 ` Jason Wang
2020-12-23 14:17 ` Yongji Xie
2020-12-24 3:01 ` Jason Wang
2020-12-24 8:34 ` Yongji Xie
2020-12-25 6:59 ` Jason Wang
2021-01-08 13:32 ` Bob Liu
2021-01-10 10:03 ` Yongji Xie
2020-12-22 14:52 ` [RFC v2 07/13] vduse: support get/set virtqueue state Xie Yongji
2020-12-22 14:52 ` [RFC v2 08/13] vdpa: Introduce process_iotlb_msg() in vdpa_config_ops Xie Yongji
2020-12-23 8:36 ` Jason Wang
2020-12-23 11:06 ` Yongji Xie
2020-12-24 2:36 ` Jason Wang
2020-12-24 7:24 ` Yongji Xie
2020-12-22 14:52 ` [RFC v2 09/13] vduse: Add support for processing vhost iotlb message Xie Yongji
2020-12-23 9:05 ` Jason Wang
2020-12-23 12:14 ` [External] " Yongji Xie
2020-12-24 2:41 ` Jason Wang
2020-12-24 7:37 ` Yongji Xie
2020-12-25 2:37 ` Yongji Xie
2020-12-25 7:02 ` Jason Wang
2020-12-25 11:36 ` Yongji Xie
2020-12-25 6:57 ` Jason Wang
2020-12-25 10:31 ` Yongji Xie
2020-12-28 7:43 ` Jason Wang
2020-12-28 8:14 ` Yongji Xie
2020-12-28 8:43 ` Jason Wang
2020-12-28 9:12 ` Yongji Xie
2020-12-29 9:11 ` Jason Wang
2020-12-29 10:26 ` Yongji Xie
2020-12-30 6:10 ` Jason Wang
2020-12-30 7:09 ` Yongji Xie
2020-12-30 8:41 ` Jason Wang
2020-12-30 10:12 ` Yongji Xie
2020-12-31 2:49 ` Jason Wang
2020-12-31 5:15 ` Yongji Xie
2020-12-31 5:49 ` Jason Wang
2020-12-31 6:52 ` Yongji Xie
2020-12-31 7:11 ` Jason Wang
2020-12-31 8:00 ` Yongji Xie
2020-12-22 14:52 ` [RFC v2 10/13] vduse: grab the module's references until there is no vduse device Xie Yongji
2020-12-22 14:52 ` [RFC v2 11/13] vduse/iova_domain: Support reclaiming bounce pages Xie Yongji
2020-12-22 14:52 ` Xie Yongji [this message]
2020-12-22 14:52 ` [RFC v2 13/13] vduse: Introduce a workqueue for irq injection Xie Yongji
2020-12-23 6:38 ` [RFC v2 00/13] Introduce VDUSE - vDPA Device in Userspace Jason Wang
2020-12-23 8:14 ` Jason Wang
2020-12-23 10:59 ` Yongji Xie
2020-12-24 2:24 ` Jason Wang
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