[v2,11/22] netfs: Use mempools for allocating requests and subrequests

Message ID	20240430140056.261997-12-dhowells@redhat.com
State	New
Headers	show Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4840719066D for <ceph-devel@vger.kernel.org>; Tue, 30 Apr 2024 14:01:58 +0000 (UTC) From: David Howells <dhowells@redhat.com> To: Christian Brauner <christian@brauner.io>, Jeff Layton <jlayton@kernel.org>, Gao Xiang <hsiangkao@linux.alibaba.com>, Dominique Martinet <asmadeus@codewreck.org> Cc: David Howells <dhowells@redhat.com>, Matthew Wilcox <willy@infradead.org>, Steve French <smfrench@gmail.com>, Marc Dionne <marc.dionne@auristor.com>, Paulo Alcantara <pc@manguebit.com>, Shyam Prasad N <sprasad@microsoft.com>, Tom Talpey <tom@talpey.com>, Eric Van Hensbergen <ericvh@kernel.org>, Ilya Dryomov <idryomov@gmail.com>, netfs@lists.linux.dev, linux-cachefs@redhat.com, linux-afs@lists.infradead.org, linux-cifs@vger.kernel.org, linux-nfs@vger.kernel.org, ceph-devel@vger.kernel.org, v9fs@lists.linux.dev, linux-erofs@lists.ozlabs.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 11/22] netfs: Use mempools for allocating requests and subrequests Date: Tue, 30 Apr 2024 15:00:42 +0100 Message-ID: <20240430140056.261997-12-dhowells@redhat.com> In-Reply-To: <20240430140056.261997-1-dhowells@redhat.com> References: <20240430140056.261997-1-dhowells@redhat.com> Precedence: bulk MIME-Version: 1.0 Content-Transfer-Encoding: 8bit
Series	netfs, afs, 9p, cifs: Rework netfs to use ->writepages() to copy to cache \| expand [v2,00/22] netfs, afs, 9p, cifs: Rework netfs to use ->writepages() to copy to cache [v2,01/22] netfs: Update i_blocks when write committed to pagecache [v2,02/22] netfs: Replace PG_fscache by setting folio->private and marking dirty [v2,03/22] mm: Remove the PG_fscache alias for PG_private_2 [v2,04/22] netfs: Remove deprecated use of PG_private_2 as a second writeback flag [v2,05/22] netfs: Make netfs_io_request::subreq_counter an atomic_t [v2,06/22] netfs: Use subreq_counter to allocate subreq debug_index values [v2,07/22] mm: Provide a means of invalidation without using launder_folio [v2,08/22] 9p: Use alternative invalidation to using launder_folio [v2,09/22] afs: Use alternative invalidation to using launder_folio [v2,10/22] netfs: Remove ->launder_folio() support [v2,11/22] netfs: Use mempools for allocating requests and subrequests [v2,12/22] mm: Export writeback_iter() [v2,13/22] netfs: Switch to using unsigned long long rather than loff_t [v2,14/22] netfs: New writeback implementation [v2,15/22] netfs: Add some write-side stats and clean up some stat names [v2,16/22] netfs, afs: Implement helpers for new write code [v2,17/22] netfs, 9p: Implement helpers for new write code [v2,18/22] netfs, cachefiles: Implement helpers for new write code [v2,19/22] netfs: Cut over to using new writeback code [v2,20/22] netfs: Remove the old writeback code [v2,21/22] netfs: Miscellaneous tidy ups [v2,22/22] netfs, afs: Use writeback retry to deal with alternate keys

diff --git a/fs/netfs/internal.h b/fs/netfs/internal.h index 156ab138e224..c67da478cd2b 100644 --- a/fs/netfs/internal.h +++ b/fs/netfs/internal.h @@ -37,6 +37,8 @@ int netfs_begin_read(struct netfs_io_request *rreq, bool sync); extern unsigned int netfs_debug; extern struct list_head netfs_io_requests; extern spinlock_t netfs_proc_lock; +extern mempool_t netfs_request_pool; +extern mempool_t netfs_subrequest_pool; #ifdef CONFIG_PROC_FS static inline void netfs_proc_add_rreq(struct netfs_io_request *rreq) diff --git a/fs/netfs/main.c b/fs/netfs/main.c index 844efbb2e7a2..4805b9377364 100644 --- a/fs/netfs/main.c +++ b/fs/netfs/main.c @@ -7,6 +7,7 @@ #include <linux/module.h> #include <linux/export.h> +#include <linux/mempool.h> #include <linux/proc_fs.h> #include <linux/seq_file.h> #include "internal.h" @@ -23,6 +24,11 @@ unsigned netfs_debug; module_param_named(debug, netfs_debug, uint, S_IWUSR | S_IRUGO); MODULE_PARM_DESC(netfs_debug, "Netfs support debugging mask"); +static struct kmem_cache *netfs_request_slab; +static struct kmem_cache *netfs_subrequest_slab; +mempool_t netfs_request_pool; +mempool_t netfs_subrequest_pool; + #ifdef CONFIG_PROC_FS LIST_HEAD(netfs_io_requests); DEFINE_SPINLOCK(netfs_proc_lock); @@ -98,25 +104,54 @@ static int __init netfs_init(void) { int ret = -ENOMEM; + netfs_request_slab = kmem_cache_create("netfs_request", + sizeof(struct netfs_io_request), 0, + SLAB_HWCACHE_ALIGN | SLAB_ACCOUNT, + NULL); + if (!netfs_request_slab) + goto error_req; + + if (mempool_init_slab_pool(&netfs_request_pool, 100, netfs_request_slab) < 0) + goto error_reqpool; + + netfs_subrequest_slab = kmem_cache_create("netfs_subrequest", + sizeof(struct netfs_io_subrequest), 0, + SLAB_HWCACHE_ALIGN | SLAB_ACCOUNT, + NULL); + if (!netfs_subrequest_slab) + goto error_subreq; + + if (mempool_init_slab_pool(&netfs_subrequest_pool, 100, netfs_subrequest_slab) < 0) + goto error_subreqpool; + if (!proc_mkdir("fs/netfs", NULL)) - goto error; + goto error_proc; if (!proc_create_seq("fs/netfs/requests", S_IFREG | 0444, NULL, &netfs_requests_seq_ops)) - goto error_proc; + goto error_procfile; #ifdef CONFIG_FSCACHE_STATS if (!proc_create_single("fs/netfs/stats", S_IFREG | 0444, NULL, netfs_stats_show)) - goto error_proc; + goto error_procfile; #endif ret = fscache_init(); if (ret < 0) - goto error_proc; + goto error_fscache; return 0; -error_proc: +error_fscache: +error_procfile: remove_proc_entry("fs/netfs", NULL); -error: +error_proc: + mempool_exit(&netfs_subrequest_pool); +error_subreqpool: + kmem_cache_destroy(netfs_subrequest_slab); +error_subreq: + mempool_exit(&netfs_request_pool); +error_reqpool: + kmem_cache_destroy(netfs_request_slab); +error_req: return ret; } fs_initcall(netfs_init); @@ -125,5 +160,9 @@ static void __exit netfs_exit(void) { fscache_exit(); remove_proc_entry("fs/netfs", NULL); + mempool_exit(&netfs_subrequest_pool); + kmem_cache_destroy(netfs_subrequest_slab); + mempool_exit(&netfs_request_pool); + kmem_cache_destroy(netfs_request_slab); } module_exit(netfs_exit); diff --git a/fs/netfs/objects.c b/fs/netfs/objects.c index 8acc03a64059..1a4e2ce735ce 100644 --- a/fs/netfs/objects.c +++ b/fs/netfs/objects.c @@ -6,6 +6,8 @@ */ #include <linux/slab.h> +#include <linux/mempool.h> +#include <linux/delay.h> #include "internal.h" /* @@ -20,17 +22,22 @@ struct netfs_io_request *netfs_alloc_request(struct address_space *mapping, struct inode *inode = file ? file_inode(file) : mapping->host; struct netfs_inode *ctx = netfs_inode(inode); struct netfs_io_request *rreq; + mempool_t *mempool = ctx->ops->request_pool ?: &netfs_request_pool; + struct kmem_cache *cache = mempool->pool_data; bool is_unbuffered = (origin == NETFS_UNBUFFERED_WRITE || origin == NETFS_DIO_READ || origin == NETFS_DIO_WRITE); bool cached = !is_unbuffered && netfs_is_cache_enabled(ctx); int ret; - rreq = kzalloc(ctx->ops->io_request_size ?: sizeof(struct netfs_io_request), - GFP_KERNEL); - if (!rreq) - return ERR_PTR(-ENOMEM); + for (;;) { + rreq = mempool_alloc(mempool, GFP_KERNEL); + if (rreq) + break; + msleep(10); + } + memset(rreq, 0, kmem_cache_size(cache)); rreq->start = start; rreq->len = len; rreq->upper_len = len; @@ -56,7 +63,7 @@ struct netfs_io_request *netfs_alloc_request(struct address_space *mapping, if (rreq->netfs_ops->init_request) { ret = rreq->netfs_ops->init_request(rreq, file); if (ret < 0) { - kfree(rreq); + mempool_free(rreq, rreq->netfs_ops->request_pool ?: &netfs_request_pool); return ERR_PTR(ret); } } @@ -88,6 +95,14 @@ void netfs_clear_subrequests(struct netfs_io_request *rreq, bool was_async) } } +static void netfs_free_request_rcu(struct rcu_head *rcu) +{ + struct netfs_io_request *rreq = container_of(rcu, struct netfs_io_request, rcu); + + mempool_free(rreq, rreq->netfs_ops->request_pool ?: &netfs_request_pool); + netfs_stat_d(&netfs_n_rh_rreq); +} + static void netfs_free_request(struct work_struct *work) { struct netfs_io_request *rreq = @@ -110,8 +125,7 @@ static void netfs_free_request(struct work_struct *work) } kvfree(rreq->direct_bv); } - kfree_rcu(rreq, rcu); - netfs_stat_d(&netfs_n_rh_rreq); + call_rcu(&rreq->rcu, netfs_free_request_rcu); } void netfs_put_request(struct netfs_io_request *rreq, bool was_async, @@ -143,20 +157,25 @@ void netfs_put_request(struct netfs_io_request *rreq, bool was_async, struct netfs_io_subrequest *netfs_alloc_subrequest(struct netfs_io_request *rreq) { struct netfs_io_subrequest *subreq; - - subreq = kzalloc(rreq->netfs_ops->io_subrequest_size ?: - sizeof(struct netfs_io_subrequest), - GFP_KERNEL); - if (subreq) { - INIT_WORK(&subreq->work, NULL); - INIT_LIST_HEAD(&subreq->rreq_link); - refcount_set(&subreq->ref, 2); - subreq->rreq = rreq; - subreq->debug_index = atomic_inc_return(&rreq->subreq_counter); - netfs_get_request(rreq, netfs_rreq_trace_get_subreq); - netfs_stat(&netfs_n_rh_sreq); + mempool_t *mempool = rreq->netfs_ops->subrequest_pool ?: &netfs_subrequest_pool; + struct kmem_cache *cache = mempool->pool_data; + + for (;;) { + subreq = mempool_alloc(rreq->netfs_ops->subrequest_pool ?: &netfs_subrequest_pool, + GFP_KERNEL); + if (subreq) + break; + msleep(10); } + memset(subreq, 0, kmem_cache_size(cache)); + INIT_WORK(&subreq->work, NULL); + INIT_LIST_HEAD(&subreq->rreq_link); + refcount_set(&subreq->ref, 2); + subreq->rreq = rreq; + subreq->debug_index = atomic_inc_return(&rreq->subreq_counter); + netfs_get_request(rreq, netfs_rreq_trace_get_subreq); + netfs_stat(&netfs_n_rh_sreq); return subreq; } @@ -178,7 +197,7 @@ static void netfs_free_subrequest(struct netfs_io_subrequest *subreq, trace_netfs_sreq(subreq, netfs_sreq_trace_free); if (rreq->netfs_ops->free_subrequest) rreq->netfs_ops->free_subrequest(subreq); - kfree(subreq); + mempool_free(subreq, rreq->netfs_ops->subrequest_pool ?: &netfs_subrequest_pool); netfs_stat_d(&netfs_n_rh_sreq); netfs_put_request(rreq, was_async, netfs_rreq_trace_put_subreq); } diff --git a/include/linux/netfs.h b/include/linux/netfs.h index 3af589dabd7f..0b6c2c2d3c23 100644 --- a/include/linux/netfs.h +++ b/include/linux/netfs.h @@ -20,6 +20,7 @@ #include <linux/uio.h> enum netfs_sreq_ref_trace; +typedef struct mempool_s mempool_t; /** * folio_start_private_2 - Start an fscache write on a folio. [DEPRECATED] @@ -236,8 +237,8 @@ struct netfs_io_request { * Operations the network filesystem can/must provide to the helpers. */ struct netfs_request_ops { - unsigned int io_request_size; /* Alloc size for netfs_io_request struct */ - unsigned int io_subrequest_size; /* Alloc size for netfs_io_subrequest struct */ + mempool_t *request_pool; + mempool_t *subrequest_pool; int (*init_request)(struct netfs_io_request *rreq, struct file *file); void (*free_request)(struct netfs_io_request *rreq); void (*free_subrequest)(struct netfs_io_subrequest *rreq);

[v2,11/22] netfs: Use mempools for allocating requests and subrequests

Commit Message

Patch