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Date: Mon, 30 Jul 2018 11:34:23 +0200
From: Dominique Martinet <asmadeus@...ewreck.org>
To: v9fs-developer@...ts.sourceforge.net
Cc: Greg Kurz <groug@...d.org>, Matthew Wilcox <willy@...radead.org>,
linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] net/9p: add a per-client fcall kmem_cache
From: Dominique Martinet <dominique.martinet@....fr>
Having a specific cache for the fcall allocations helps speed up
allocations a bit, especially in case of non-"round" msizes.
The caches will automatically be merged if there are multiple caches
of items with the same size so we do not need to try to share a cache
between different clients of the same size.
Since the msize is negotiated with the server, only allocate the cache
after that negotiation has happened - previous allocations or
allocations of different sizes (e.g. zero-copy fcall) are made with
kmalloc directly.
Signed-off-by: Dominique Martinet <dominique.martinet@....fr>
---
include/net/9p/client.h | 2 ++
net/9p/client.c | 40 ++++++++++++++++++++++++++++++++--------
net/9p/trans_rdma.c | 2 +-
3 files changed, 35 insertions(+), 9 deletions(-)
diff --git a/include/net/9p/client.h b/include/net/9p/client.h
index 4b4ac1362ad5..8d9bc7402a42 100644
--- a/include/net/9p/client.h
+++ b/include/net/9p/client.h
@@ -123,6 +123,7 @@ struct p9_client {
struct p9_trans_module *trans_mod;
enum p9_trans_status status;
void *trans;
+ struct kmem_cache *fcall_cache;
union {
struct {
@@ -230,6 +231,7 @@ int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode,
kgid_t gid, struct p9_qid *);
int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status);
int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *fl);
+void p9_fcall_free(struct p9_client *c, struct p9_fcall *fc);
struct p9_req_t *p9_tag_lookup(struct p9_client *, u16);
void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status);
diff --git a/net/9p/client.c b/net/9p/client.c
index ba99a94a12c9..215e3b1ed7b4 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -231,15 +231,34 @@ static int parse_opts(char *opts, struct p9_client *clnt)
return ret;
}
-static int p9_fcall_alloc(struct p9_fcall *fc, int alloc_msize)
+static int p9_fcall_alloc(struct p9_client *c, struct p9_fcall *fc,
+ int alloc_msize)
{
- fc->sdata = kmalloc(alloc_msize, GFP_NOFS);
+ if (c->fcall_cache && alloc_msize == c->msize)
+ fc->sdata = kmem_cache_alloc(c->fcall_cache, GFP_NOFS);
+ else
+ fc->sdata = kmalloc(alloc_msize, GFP_NOFS);
if (!fc->sdata)
return -ENOMEM;
fc->capacity = alloc_msize;
return 0;
}
+void p9_fcall_free(struct p9_client *c, struct p9_fcall *fc)
+{
+ /* sdata can be NULL for interrupted requests in trans_rdma,
+ * and kmem_cache_free does not do NULL-check for us
+ */
+ if (unlikely(!fc->sdata))
+ return;
+
+ if (c->fcall_cache && fc->capacity == c->msize)
+ kmem_cache_free(c->fcall_cache, fc->sdata);
+ else
+ kfree(fc->sdata);
+}
+EXPORT_SYMBOL(p9_fcall_free);
+
static struct kmem_cache *p9_req_cache;
/**
@@ -261,9 +280,9 @@ p9_tag_alloc(struct p9_client *c, int8_t type, unsigned int max_size)
if (!req)
return NULL;
- if (p9_fcall_alloc(&req->tc, alloc_msize))
+ if (p9_fcall_alloc(c, &req->tc, alloc_msize))
goto free;
- if (p9_fcall_alloc(&req->rc, alloc_msize))
+ if (p9_fcall_alloc(c, &req->rc, alloc_msize))
goto free;
p9pdu_reset(&req->tc);
@@ -288,8 +307,8 @@ p9_tag_alloc(struct p9_client *c, int8_t type, unsigned int max_size)
return req;
free:
- kfree(req->tc.sdata);
- kfree(req->rc.sdata);
+ p9_fcall_free(c, &req->tc);
+ p9_fcall_free(c, &req->rc);
kmem_cache_free(p9_req_cache, req);
return ERR_PTR(-ENOMEM);
}
@@ -333,8 +352,8 @@ static void p9_free_req(struct p9_client *c, struct p9_req_t *r)
spin_lock_irqsave(&c->lock, flags);
idr_remove(&c->reqs, tag);
spin_unlock_irqrestore(&c->lock, flags);
- kfree(r->tc.sdata);
- kfree(r->rc.sdata);
+ p9_fcall_free(c, &r->tc);
+ p9_fcall_free(c, &r->rc);
kmem_cache_free(p9_req_cache, r);
}
@@ -944,6 +963,7 @@ struct p9_client *p9_client_create(const char *dev_name, char *options)
clnt->trans_mod = NULL;
clnt->trans = NULL;
+ clnt->fcall_cache = NULL;
client_id = utsname()->nodename;
memcpy(clnt->name, client_id, strlen(client_id) + 1);
@@ -980,6 +1000,9 @@ struct p9_client *p9_client_create(const char *dev_name, char *options)
if (err)
goto close_trans;
+ clnt->fcall_cache = kmem_cache_create("9p-fcall-cache", clnt->msize,
+ 0, 0, NULL);
+
return clnt;
close_trans:
@@ -1011,6 +1034,7 @@ void p9_client_destroy(struct p9_client *clnt)
p9_tag_cleanup(clnt);
+ kmem_cache_destroy(clnt->fcall_cache);
kfree(clnt);
}
EXPORT_SYMBOL(p9_client_destroy);
diff --git a/net/9p/trans_rdma.c b/net/9p/trans_rdma.c
index c5cac97df7f7..5e43f0a00b3a 100644
--- a/net/9p/trans_rdma.c
+++ b/net/9p/trans_rdma.c
@@ -445,7 +445,7 @@ static int rdma_request(struct p9_client *client, struct p9_req_t *req)
if (unlikely(atomic_read(&rdma->excess_rc) > 0)) {
if ((atomic_sub_return(1, &rdma->excess_rc) >= 0)) {
/* Got one! */
- kfree(req->rc.sdata);
+ p9_fcall_free(client, &req->rc);
req->rc.sdata = NULL;
goto dont_need_post_recv;
} else {
--
2.17.1
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