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vnc: buffer code improvements, bugfixes.

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Merge remote-tracking branch 'remotes/kraxel/tags/pull-vnc-20151116-1' into staging

vnc: buffer code improvements, bugfixes.

# gpg: Signature made Mon 16 Nov 2015 17:20:02 GMT using RSA key ID D3E87138
# gpg: Good signature from "Gerd Hoffmann (work) <kraxel@redhat.com>"
# gpg:                 aka "Gerd Hoffmann <gerd@kraxel.org>"
# gpg:                 aka "Gerd Hoffmann (private) <kraxel@gmail.com>"

* remotes/kraxel/tags/pull-vnc-20151116-1:
  vnc: fix mismerge
  buffer: allow a buffer to shrink gracefully
  buffer: factor out buffer_adj_size
  buffer: factor out buffer_req_size
  vnc: recycle empty vs->output buffer
  vnc: fix local state init
  vnc: only alloc server surface with clients connected
  vnc: use vnc_{width,height} in vnc_set_area_dirty
  vnc: factor out vnc_update_server_surface
  vnc: add vnc_width+vnc_height helpers
  vnc: zap dead code
  vnc-jobs: move buffer reset, use new buffer move
  vnc: kill jobs queue buffer
  vnc: attach names to buffers
  buffer: add tracing
  buffer: add buffer_shrink
  buffer: add buffer_move
  buffer: add buffer_move_empty
  buffer: add buffer_init
  buffer: make the Buffer capacity increase in powers of two

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2015-11-17 12:34:07 +00:00
commit c27e9014d5
5 changed files with 245 additions and 40 deletions
Download patch file Download diff file Expand all files Collapse all files

34
ui/vnc-jobs.c
View file

@ -29,6 +29,7 @@
#include "vnc.h"
#include "vnc-jobs.h"
#include "qemu/sockets.h"
#include "qemu/main-loop.h"
#include "block/aio.h"
/*
@ -54,7 +55,6 @@ struct VncJobQueue {
QemuCond cond;
QemuMutex mutex;
QemuThread thread;
Buffer buffer;
bool exit;
QTAILQ_HEAD(, VncJob) jobs;
};
@ -166,8 +166,11 @@ void vnc_jobs_consume_buffer(VncState *vs)
vnc_lock_output(vs);
if (vs->jobs_buffer.offset) {
vnc_write(vs, vs->jobs_buffer.buffer, vs->jobs_buffer.offset);
buffer_reset(&vs->jobs_buffer);
if (vs->csock != -1 && buffer_empty(&vs->output)) {
qemu_set_fd_handler(vs->csock, vnc_client_read,
vnc_client_write, vs);
}
buffer_move(&vs->output, &vs->jobs_buffer);
}
flush = vs->csock != -1 && vs->abort != true;
vnc_unlock_output(vs);
@ -182,6 +185,9 @@ void vnc_jobs_consume_buffer(VncState *vs)
*/
static void vnc_async_encoding_start(VncState *orig, VncState *local)
{
buffer_init(&local->output, "vnc-worker-output");
local->csock = -1; /* Don't do any network work on this thread */
local->vnc_encoding = orig->vnc_encoding;
local->features = orig->features;
local->vd = orig->vd;
@ -193,10 +199,6 @@ static void vnc_async_encoding_start(VncState *orig, VncState *local)
local->zlib = orig->zlib;
local->hextile = orig->hextile;
local->zrle = orig->zrle;
local->output = queue->buffer;
local->csock = -1; /* Don't do any network work on this thread */
buffer_reset(&local->output);
}
static void vnc_async_encoding_end(VncState *orig, VncState *local)
@ -206,15 +208,13 @@ static void vnc_async_encoding_end(VncState *orig, VncState *local)
orig->hextile = local->hextile;
orig->zrle = local->zrle;
orig->lossy_rect = local->lossy_rect;
queue->buffer = local->output;
}
static int vnc_worker_thread_loop(VncJobQueue *queue)
{
VncJob *job;
VncRectEntry *entry, *tmp;
VncState vs;
VncState vs = {};
int n_rectangles;
int saved_offset;
@ -235,6 +235,14 @@ static int vnc_worker_thread_loop(VncJobQueue *queue)
vnc_unlock_output(job->vs);
goto disconnected;
}
if (buffer_empty(&job->vs->output)) {
/*
* Looks like a NOP as it obviously moves no data. But it
* moves the empty buffer, so we don't have to malloc a new
* one for vs.output
*/
buffer_move_empty(&vs.output, &job->vs->output);
}
vnc_unlock_output(job->vs);
/* Make a local copy of vs and switch output buffers */
@ -274,14 +282,13 @@ static int vnc_worker_thread_loop(VncJobQueue *queue)
vnc_lock_output(job->vs);
if (job->vs->csock != -1) {
buffer_reserve(&job->vs->jobs_buffer, vs.output.offset);
buffer_append(&job->vs->jobs_buffer, vs.output.buffer,
vs.output.offset);
buffer_move(&job->vs->jobs_buffer, &vs.output);
/* Copy persistent encoding data */
vnc_async_encoding_end(job->vs, &vs);
qemu_bh_schedule(job->vs->bh);
} else {
buffer_reset(&vs.output);
/* Copy persistent encoding data */
vnc_async_encoding_end(job->vs, &vs);
}
@ -310,7 +317,6 @@ static void vnc_queue_clear(VncJobQueue *q)
{
qemu_cond_destroy(&queue->cond);
qemu_mutex_destroy(&queue->mutex);
buffer_free(&queue->buffer);
g_free(q);
queue = NULL; /* Unset global queue */
}