From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx1.redhat.com ([209.132.183.28]:38438 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728387AbeLJRNf (ORCPT ); Mon, 10 Dec 2018 12:13:35 -0500 From: Vivek Goyal To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: vgoyal@redhat.com, miklos@szeredi.hu, stefanha@redhat.com, dgilbert@redhat.com, sweil@redhat.com, swhiteho@redhat.com Subject: [PATCH 36/52] fuse: Kick worker when free memory drops below 20% of total ranges Date: Mon, 10 Dec 2018 12:13:02 -0500 Message-Id: <20181210171318.16998-37-vgoyal@redhat.com> In-Reply-To: <20181210171318.16998-1-vgoyal@redhat.com> References: <20181210171318.16998-1-vgoyal@redhat.com> Sender: linux-fsdevel-owner@vger.kernel.org List-ID: Kick worker to free up some memory when number of free ranges drops below 20% of total free ranges at the time of initialization. Signed-off-by: Vivek Goyal --- fs/fuse/file.c | 11 ++++++++++- fs/fuse/fuse_i.h | 9 +++++++++ fs/fuse/inode.c | 1 + 3 files changed, 20 insertions(+), 1 deletion(-) diff --git a/fs/fuse/file.c b/fs/fuse/file.c index 13db83d105ff..1f172d372eeb 100644 --- a/fs/fuse/file.c +++ b/fs/fuse/file.c @@ -186,6 +186,7 @@ static void fuse_link_write_file(struct file *file) static struct fuse_dax_mapping *alloc_dax_mapping(struct fuse_conn *fc) { + unsigned long free_threshold; struct fuse_dax_mapping *dmap = NULL; spin_lock(&fc->lock); @@ -193,7 +194,7 @@ static struct fuse_dax_mapping *alloc_dax_mapping(struct fuse_conn *fc) /* TODO: Add logic to try to free up memory if wait is allowed */ if (fc->nr_free_ranges <= 0) { spin_unlock(&fc->lock); - return NULL; + goto out_kick; } WARN_ON(list_empty(&fc->free_ranges)); @@ -204,6 +205,14 @@ static struct fuse_dax_mapping *alloc_dax_mapping(struct fuse_conn *fc) list_del_init(&dmap->list); fc->nr_free_ranges--; spin_unlock(&fc->lock); + +out_kick: + /* If number of free ranges are below threshold, start reclaim */ + free_threshold = (fc->nr_ranges * FUSE_DAX_RECLAIM_THRESHOLD)/100; + if (free_threshold > 0 && fc->nr_free_ranges < free_threshold) { + pr_debug("fuse: Kicking dax memory reclaim worker. nr_free_ranges=0x%ld nr_total_ranges=%ld\n", fc->nr_free_ranges, fc->nr_ranges); + queue_delayed_work(system_long_wq, &fc->dax_free_work, 0); + } return dmap; } diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h index 383deaf0ecf1..bbefa7c11078 100644 --- a/fs/fuse/fuse_i.h +++ b/fs/fuse/fuse_i.h @@ -53,6 +53,13 @@ /* Number of ranges reclaimer will try to free in one invocation */ #define FUSE_DAX_RECLAIM_CHUNK (10) +/* + * Dax memory reclaim threshold in percetage of total ranges. When free + * number of free ranges drops below this threshold, reclaim can trigger + * Default is 20% + * */ +#define FUSE_DAX_RECLAIM_THRESHOLD (20) + /** List of active connections */ extern struct list_head fuse_conn_list; @@ -885,6 +892,8 @@ struct fuse_conn { */ unsigned long nr_free_ranges; struct list_head free_ranges; + + unsigned long nr_ranges; }; static inline struct fuse_conn *get_fuse_conn_super(struct super_block *sb) diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c index 44f7bc44e319..d31acb97eede 100644 --- a/fs/fuse/inode.c +++ b/fs/fuse/inode.c @@ -675,6 +675,7 @@ static int fuse_dax_mem_range_init(struct fuse_conn *fc, list_replace_init(&mem_ranges, &fc->free_ranges); fc->nr_free_ranges = allocated_ranges; + fc->nr_ranges = allocated_ranges; return 0; out_err: /* Free All allocated elements */ -- 2.13.6