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plugins/elements/gstfilesrc.*: Add "sequential" property, off by default, to use madvise and hint to the kernel that ...

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Original commit message from CVS:
* plugins/elements/gstfilesrc.c: (gst_file_src_class_init),
(gst_file_src_init), (gst_file_src_set_property),
(gst_file_src_get_property), (gst_file_src_map_region):
* plugins/elements/gstfilesrc.h:
Add "sequential" property, off by default, to use madvise and hint
to the kernel that sequential access is desired.
Touch all retrieved pages by default to ensure they are pulled
into memory. (Closes #345720)
This commit is contained in:
Jan Schmidt 2006-07-04 09:01:51 +00:00
parent b0275f1f5f
commit 16ac778f31
3 changed files with 34 additions and 4 deletions
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11
ChangeLog
View file

@ -1,3 +1,14 @@
2006-07-04 Jan Schmidt <thaytan@mad.scientist.com>
* plugins/elements/gstfilesrc.c: (gst_file_src_class_init),
(gst_file_src_init), (gst_file_src_set_property),
(gst_file_src_get_property), (gst_file_src_map_region):
* plugins/elements/gstfilesrc.h:
Add "sequential" property, off by default, to use madvise and hint
to the kernel that sequential access is desired.
Touch all retrieved pages by default to ensure they are pulled
into memory. (Closes #345720)
2006-07-03 Wim Taymans <wim@fluendo.com>
* docs/design/part-block.txt:

25
plugins/elements/gstfilesrc.c
View file

@ -131,8 +131,9 @@ enum
#define DEFAULT_BLOCKSIZE 4*1024
#define DEFAULT_MMAPSIZE 4*1024*1024
#define DEFAULT_TOUCH FALSE
#define DEFAULT_TOUCH TRUE
#define DEFAULT_USEMMAP TRUE
#define DEFAULT_SEQUENTIAL FALSE
enum
{
@ -140,6 +141,7 @@ enum
ARG_LOCATION,
ARG_FD,
ARG_MMAPSIZE,
ARG_SEQUENTIAL,
ARG_TOUCH,
ARG_USEMMAP
};
@ -223,6 +225,11 @@ gst_file_src_class_init (GstFileSrcClass * klass)
g_param_spec_boolean ("use-mmap", "Use mmap to read data",
"Whether to use mmap. FALSE to force normal read() calls",
DEFAULT_USEMMAP, G_PARAM_READWRITE));
g_object_class_install_property (gobject_class, ARG_SEQUENTIAL,
g_param_spec_boolean ("sequential", "Optimise for sequential mmap access",
"Whether to use madvise to hint to the kernel that access to "
"mmap pages will be sequential",
DEFAULT_SEQUENTIAL, G_PARAM_READWRITE));
gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_file_src_finalize);
@ -253,6 +260,7 @@ gst_file_src_init (GstFileSrc * src, GstFileSrcClass * g_class)
src->mapbuf = NULL;
src->mapsize = DEFAULT_MMAPSIZE; /* default is 4MB */
src->use_mmap = DEFAULT_USEMMAP;
src->sequential = DEFAULT_SEQUENTIAL;
src->is_regular = FALSE;
}
@ -337,6 +345,10 @@ gst_file_src_set_property (GObject * object, guint prop_id,
src->touch = g_value_get_boolean (value);
g_object_notify (G_OBJECT (src), "touch");
break;
case ARG_SEQUENTIAL:
src->sequential = g_value_get_boolean (value);
g_object_notify (G_OBJECT (src), "sequential");
break;
case ARG_USEMMAP:
src->use_mmap = g_value_get_boolean (value);
g_object_notify (G_OBJECT (src), "use-mmap");
@ -370,6 +382,9 @@ gst_file_src_get_property (GObject * object, guint prop_id, GValue * value,
case ARG_TOUCH:
g_value_set_boolean (value, src->touch);
break;
case ARG_SEQUENTIAL:
g_value_set_boolean (value, src->sequential);
break;
case ARG_USEMMAP:
g_value_set_boolean (value, src->use_mmap);
break;
@ -523,9 +538,11 @@ gst_file_src_map_region (GstFileSrc * src, off_t offset, size_t size,
GST_MMAP_BUFFER (buf)->filesrc = src;
#ifdef MADV_SEQUENTIAL
/* madvise to tell the kernel what to do with it */
if (madvise (mmapregion, size, MADV_SEQUENTIAL) < 0) {
GST_WARNING_OBJECT (src, "warning: madvise failed: %s", strerror (errno));
if (src->sequential) {
/* madvise to tell the kernel what to do with it */
if (madvise (mmapregion, size, MADV_SEQUENTIAL) < 0) {
GST_WARNING_OBJECT (src, "warning: madvise failed: %s", strerror (errno));
}
}
#endif

2
plugins/elements/gstfilesrc.h
View file

@ -63,6 +63,8 @@ struct _GstFileSrc {
gboolean touch; /* whether to touch every page */
gboolean using_mmap; /* whether we opened it with mmap */
gboolean sequential; /* Whether to madvise (MADV_SEQUENTIAL)
for mmap pages */
gboolean seekable; /* whether the file is seekable */
gboolean is_regular; /* whether it's a (symlink to a)
regular file */