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jtag: commands: save a pointer to list tail 

By saving a pointer to the tail of the list,
we don't need to traverse the entire command
queue before we're able to append an item to
it.

With this patch, I see a 10% improvement when
using the embedded XDS100v2 on AM437x IDK board
to load a 4MiB binary (linux zImage) to DDR
with load_image.

IOW, we went from ~305kB/sec to ~336kb/sec.

Change-Id: Idb55d49f0d0106043374ab520b2f3b6b32f2c50f
Signed-off-by: Felipe Balbi <balbi@ti.com>
Reviewed-on: http://openocd.zylin.com/2709
Tested-by: jenkins
Reviewed-by: Stian Skjelstad <stian@nixia.no>
Reviewed-by: Daniele Emancipato <daniele12457@hotmail.com>
Reviewed-by: Matthias Welwarsky <matthias@welwarsky.de>
Reviewed-by: Freddie Chopin <freddie.chopin@gmail.com>
This commit is contained in:
Felipe Balbi 2015-04-09 13:31:17 -05:00 committed by Freddie Chopin
parent a652a4ea20
commit 2bb9256c34
1 changed files with 5 additions and 3 deletions
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8
src/jtag/commands.c
View File

@ -36,13 +36,14 @@
#include "commands.h"
struct cmd_queue_page {
struct cmd_queue_page *next;
void *address;
size_t used;
struct cmd_queue_page *next;
};
#define CMD_QUEUE_PAGE_SIZE (1024 * 1024)
static struct cmd_queue_page *cmd_queue_pages;
static struct cmd_queue_page *cmd_queue_pages_tail;
struct jtag_command *jtag_command_queue;
static struct jtag_command **next_command_pointer = &jtag_command_queue;
@ -100,8 +101,7 @@ void *cmd_queue_alloc(size_t size)
/* Done... */
if (*p_page) {
while ((*p_page)->next)
p_page = &((*p_page)->next);
p_page = &cmd_queue_pages_tail;
if (CMD_QUEUE_PAGE_SIZE - (*p_page)->used < size)
p_page = &((*p_page)->next);
}
@ -113,6 +113,7 @@ void *cmd_queue_alloc(size_t size)
CMD_QUEUE_PAGE_SIZE : size;
(*p_page)->address = malloc(alloc_size);
(*p_page)->next = NULL;
cmd_queue_pages_tail = *p_page;
}
offset = (*p_page)->used;
@ -134,6 +135,7 @@ static void cmd_queue_free(void)
}
cmd_queue_pages = NULL;
cmd_queue_pages_tail = NULL;
}
void jtag_command_queue_reset(void)