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Message-Id: <20210527062148.9361-15-songmuchun@bytedance.com>
Date: Thu, 27 May 2021 14:21:41 +0800
From: Muchun Song <songmuchun@...edance.com>
To: willy@...radead.org, akpm@...ux-foundation.org, hannes@...xchg.org,
mhocko@...nel.org, vdavydov.dev@...il.com, shakeelb@...gle.com,
guro@...com, shy828301@...il.com, alexs@...nel.org,
richard.weiyang@...il.com, david@...morbit.com,
trond.myklebust@...merspace.com, anna.schumaker@...app.com
Cc: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-mm@...ck.org, linux-nfs@...r.kernel.org,
zhengqi.arch@...edance.com, duanxiongchun@...edance.com,
fam.zheng@...edance.com, Muchun Song <songmuchun@...edance.com>
Subject: [PATCH v2 14/21] nfs42: use a specific kmem_cache to allocate nfs4_xattr_entry
If we want to add the allocated objects to its list_lru, we should use
kmem_cache_alloc_lru() to allocate objects. So intruduce
nfs4_xattr_entry_cachep which is used to allocate nfs4_xattr_entry.
Signed-off-by: Muchun Song <songmuchun@...edance.com>
---
fs/nfs/nfs42xattr.c | 95 ++++++++++++++++++++++++++---------------------------
1 file changed, 47 insertions(+), 48 deletions(-)
diff --git a/fs/nfs/nfs42xattr.c b/fs/nfs/nfs42xattr.c
index 1c4d2a05b401..5b7af9080db0 100644
--- a/fs/nfs/nfs42xattr.c
+++ b/fs/nfs/nfs42xattr.c
@@ -81,7 +81,7 @@ struct nfs4_xattr_entry {
struct hlist_node hnode;
struct list_head lru;
struct list_head dispose;
- char *xattr_name;
+ const char *xattr_name;
void *xattr_value;
size_t xattr_size;
struct nfs4_xattr_bucket *bucket;
@@ -98,6 +98,7 @@ static struct list_lru nfs4_xattr_entry_lru;
static struct list_lru nfs4_xattr_large_entry_lru;
static struct kmem_cache *nfs4_xattr_cache_cachep;
+static struct kmem_cache *nfs4_xattr_entry_cachep;
/*
* Hashing helper functions.
@@ -177,49 +178,27 @@ nfs4_xattr_alloc_entry(const char *name, const void *value,
{
struct nfs4_xattr_entry *entry;
void *valp;
- char *namep;
- size_t alloclen, slen;
- char *buf;
- uint32_t flags;
+ const char *namep;
+ uint32_t flags = len > PAGE_SIZE ? NFS4_XATTR_ENTRY_EXTVAL : 0;
+ gfp_t gfp = GFP_KERNEL_ACCOUNT | GFP_NOFS;
+ struct list_lru *lru;
BUILD_BUG_ON(sizeof(struct nfs4_xattr_entry) +
XATTR_NAME_MAX + 1 > PAGE_SIZE);
- alloclen = sizeof(struct nfs4_xattr_entry);
- if (name != NULL) {
- slen = strlen(name) + 1;
- alloclen += slen;
- } else
- slen = 0;
-
- if (alloclen + len <= PAGE_SIZE) {
- alloclen += len;
- flags = 0;
- } else {
- flags = NFS4_XATTR_ENTRY_EXTVAL;
- }
-
- buf = kmalloc(alloclen, GFP_KERNEL_ACCOUNT | GFP_NOFS);
- if (buf == NULL)
+ lru = flags & NFS4_XATTR_ENTRY_EXTVAL ? &nfs4_xattr_large_entry_lru :
+ &nfs4_xattr_entry_lru;
+ entry = kmem_cache_alloc_lru(nfs4_xattr_entry_cachep, lru, gfp);
+ if (!entry)
return NULL;
- entry = (struct nfs4_xattr_entry *)buf;
-
- if (name != NULL) {
- namep = buf + sizeof(struct nfs4_xattr_entry);
- memcpy(namep, name, slen);
- } else {
- namep = NULL;
- }
-
-
- if (flags & NFS4_XATTR_ENTRY_EXTVAL) {
- valp = kvmalloc(len, GFP_KERNEL_ACCOUNT | GFP_NOFS);
- if (valp == NULL) {
- kfree(buf);
- return NULL;
- }
- } else if (len != 0) {
- valp = buf + sizeof(struct nfs4_xattr_entry) + slen;
+ namep = kstrdup_const(name, gfp);
+ if (!namep && name)
+ goto free_buf;
+
+ if (len != 0) {
+ valp = kvmalloc(len, gfp);
+ if (!valp)
+ goto free_name;
} else
valp = NULL;
@@ -232,23 +211,23 @@ nfs4_xattr_alloc_entry(const char *name, const void *value,
entry->flags = flags;
entry->xattr_value = valp;
- kref_init(&entry->ref);
entry->xattr_name = namep;
entry->xattr_size = len;
- entry->bucket = NULL;
- INIT_LIST_HEAD(&entry->lru);
- INIT_LIST_HEAD(&entry->dispose);
- INIT_HLIST_NODE(&entry->hnode);
return entry;
+free_name:
+ kfree_const(namep);
+free_buf:
+ kmem_cache_free(nfs4_xattr_entry_cachep, entry);
+ return NULL;
}
static void
nfs4_xattr_free_entry(struct nfs4_xattr_entry *entry)
{
- if (entry->flags & NFS4_XATTR_ENTRY_EXTVAL)
- kvfree(entry->xattr_value);
- kfree(entry);
+ kvfree(entry->xattr_value);
+ kfree_const(entry->xattr_name);
+ kmem_cache_free(nfs4_xattr_entry_cachep, entry);
}
static void
@@ -289,7 +268,7 @@ nfs4_xattr_alloc_cache(void)
{
struct nfs4_xattr_cache *cache;
- cache = kmem_cache_alloc(nfs4_xattr_cache_cachep,
+ cache = kmem_cache_alloc_lru(nfs4_xattr_cache_cachep, &nfs4_xattr_cache_lru,
GFP_KERNEL_ACCOUNT | GFP_NOFS);
if (cache == NULL)
return NULL;
@@ -992,6 +971,17 @@ static void nfs4_xattr_cache_init_once(void *p)
INIT_LIST_HEAD(&cache->dispose);
}
+static void nfs4_xattr_entry_init_once(void *p)
+{
+ struct nfs4_xattr_entry *entry = p;
+
+ kref_init(&entry->ref);
+ entry->bucket = NULL;
+ INIT_LIST_HEAD(&entry->lru);
+ INIT_LIST_HEAD(&entry->dispose);
+ INIT_HLIST_NODE(&entry->hnode);
+}
+
int __init nfs4_xattr_cache_init(void)
{
int ret = 0;
@@ -1003,6 +993,13 @@ int __init nfs4_xattr_cache_init(void)
if (nfs4_xattr_cache_cachep == NULL)
return -ENOMEM;
+ nfs4_xattr_entry_cachep = kmem_cache_create("nfs4_xattr_entry",
+ sizeof(struct nfs4_xattr_entry), 0,
+ (SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD | SLAB_ACCOUNT),
+ nfs4_xattr_entry_init_once);
+ if (!nfs4_xattr_entry_cachep)
+ goto out5;
+
ret = list_lru_init_memcg(&nfs4_xattr_large_entry_lru,
&nfs4_xattr_large_entry_shrinker);
if (ret)
@@ -1040,6 +1037,8 @@ int __init nfs4_xattr_cache_init(void)
out3:
list_lru_destroy(&nfs4_xattr_large_entry_lru);
out4:
+ kmem_cache_destroy(nfs4_xattr_entry_cachep);
+out5:
kmem_cache_destroy(nfs4_xattr_cache_cachep);
return ret;
--
2.11.0
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