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[PATCH v2 101/109] virtiofsd: use fuse_buf_writev to replace fuse_buf_wr
From: |
Dr. David Alan Gilbert (git) |
Subject: |
[PATCH v2 101/109] virtiofsd: use fuse_buf_writev to replace fuse_buf_write for better performance |
Date: |
Tue, 21 Jan 2020 12:24:25 +0000 |
From: piaojun <address@hidden>
fuse_buf_writev() only handles the normal write in which src is buffer
and dest is fd. Specially if src buffer represents guest physical
address that can't be mapped by the daemon process, IO must be bounced
back to the VMM to do it by fuse_buf_copy().
Signed-off-by: Jun Piao <address@hidden>
Suggested-by: Dr. David Alan Gilbert <address@hidden>
Suggested-by: Stefan Hajnoczi <address@hidden>
Reviewed-by: Daniel P. Berrangé <address@hidden>
---
tools/virtiofsd/buffer.c | 20 ++++++++++++++++++--
1 file changed, 18 insertions(+), 2 deletions(-)
diff --git a/tools/virtiofsd/buffer.c b/tools/virtiofsd/buffer.c
index 70980550d2..b75f871680 100644
--- a/tools/virtiofsd/buffer.c
+++ b/tools/virtiofsd/buffer.c
@@ -33,7 +33,6 @@ size_t fuse_buf_size(const struct fuse_bufvec *bufv)
return size;
}
-__attribute__((unused))
static ssize_t fuse_buf_writev(struct fuse_buf *out_buf,
struct fuse_bufvec *in_buf)
{
@@ -262,12 +261,29 @@ static int fuse_bufvec_advance(struct fuse_bufvec *bufv,
size_t len)
ssize_t fuse_buf_copy(struct fuse_bufvec *dstv, struct fuse_bufvec *srcv,
enum fuse_buf_copy_flags flags)
{
- size_t copied = 0;
+ size_t copied = 0, i;
if (dstv == srcv) {
return fuse_buf_size(dstv);
}
+ /*
+ * use writev to improve bandwidth when all the
+ * src buffers already mapped by the daemon
+ * process
+ */
+ for (i = 0; i < srcv->count; i++) {
+ if (srcv->buf[i].flags & FUSE_BUF_IS_FD) {
+ break;
+ }
+ }
+ if ((i == srcv->count) && (dstv->count == 1) &&
+ (dstv->idx == 0) &&
+ (dstv->buf[0].flags & FUSE_BUF_IS_FD)) {
+ dstv->buf[0].pos += dstv->off;
+ return fuse_buf_writev(&dstv->buf[0], srcv);
+ }
+
for (;;) {
const struct fuse_buf *src = fuse_bufvec_current(srcv);
const struct fuse_buf *dst = fuse_bufvec_current(dstv);
--
2.24.1
- [PATCH v2 093/109] virtiofsd: add man page, (continued)
- [PATCH v2 093/109] virtiofsd: add man page, Dr. David Alan Gilbert (git), 2020/01/21
- [PATCH v2 094/109] virtiofsd: passthrough_ll: fix refcounting on remove/rename, Dr. David Alan Gilbert (git), 2020/01/21
- [PATCH v2 095/109] virtiofsd: introduce inode refcount to prevent use-after-free, Dr. David Alan Gilbert (git), 2020/01/21
- [PATCH v2 096/109] virtiofsd: do not always set FUSE_FLOCK_LOCKS, Dr. David Alan Gilbert (git), 2020/01/21
- [PATCH v2 098/109] virtiofsd: Reset O_DIRECT flag during file open, Dr. David Alan Gilbert (git), 2020/01/21
- [PATCH v2 097/109] virtiofsd: convert more fprintf and perror to use fuse log infra, Dr. David Alan Gilbert (git), 2020/01/21
- [PATCH v2 100/109] virtiofsd: add definition of fuse_buf_writev(), Dr. David Alan Gilbert (git), 2020/01/21
- [PATCH v2 099/109] virtiofsd: Fix data corruption with O_APPEND write in writeback mode, Dr. David Alan Gilbert (git), 2020/01/21
- [PATCH v2 101/109] virtiofsd: use fuse_buf_writev to replace fuse_buf_write for better performance,
Dr. David Alan Gilbert (git) <=
- [PATCH v2 102/109] virtiofsd: process requests in a thread pool, Dr. David Alan Gilbert (git), 2020/01/21
- [PATCH v2 103/109] virtiofsd: prevent FUSE_INIT/FUSE_DESTROY races, Dr. David Alan Gilbert (git), 2020/01/21
- [PATCH v2 104/109] virtiofsd: fix lo_destroy() resource leaks, Dr. David Alan Gilbert (git), 2020/01/21
- [PATCH v2 105/109] virtiofsd: add --thread-pool-size=NUM option, Dr. David Alan Gilbert (git), 2020/01/21
- [PATCH v2 106/109] virtiofsd: Convert lo_destroy to take the lo->mutex lock itself, Dr. David Alan Gilbert (git), 2020/01/21
- [PATCH v2 107/109] virtiofsd/passthrough_ll: Pass errno to fuse_reply_err(), Dr. David Alan Gilbert (git), 2020/01/21
- [PATCH v2 108/109] virtiofsd: stop all queue threads on exit in virtio_loop(), Dr. David Alan Gilbert (git), 2020/01/21
- [PATCH v2 109/109] virtiofsd: add some options to the help message, Dr. David Alan Gilbert (git), 2020/01/21