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note: optimize noteram_add, copy as much content as possible at a time

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Signed-off-by: yinshengkai <yinshengkai@xiaomi.com>
This commit is contained in:
yinshengkai 2023-03-02 16:26:19 +08:00 committed by Xiang Xiao
parent 081b04f05e
commit 6e35a51feb
1 changed files with 23 additions and 31 deletions
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54
drivers/note/noteram_driver.c
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@ -567,7 +567,8 @@ static void noteram_add(FAR struct note_driver_s *drv,
{
FAR const char *buf = note;
unsigned int head;
unsigned int next;
unsigned int remain;
unsigned int space;
irqstate_t flags;
flags = spin_lock_irqsave_wo_note(&g_noteram_lock);
@ -578,46 +579,37 @@ static void noteram_add(FAR struct note_driver_s *drv,
return;
}
/* Get the index to the head of the circular buffer */
DEBUGASSERT(note != NULL && notelen < CONFIG_DRIVERS_NOTERAM_BUFSIZE);
head = g_noteram_info.ni_head;
remain = CONFIG_DRIVERS_NOTERAM_BUFSIZE - noteram_length();
/* Loop until all bytes have been transferred to the circular buffer */
while (notelen > 0)
if (remain < notelen)
{
/* Get the next head index. Would it collide with the current tail
* index?
*/
next = noteram_next(head, 1);
if (next == g_noteram_info.ni_tail)
if (g_noteram_info.ni_overwrite == NOTERAM_MODE_OVERWRITE_DISABLE)
{
if (g_noteram_info.ni_overwrite == NOTERAM_MODE_OVERWRITE_DISABLE)
{
/* Stop recording if not in overwrite mode */
/* Stop recording if not in overwrite mode */
g_noteram_info.ni_overwrite = NOTERAM_MODE_OVERWRITE_OVERFLOW;
spin_unlock_irqrestore_wo_note(&g_noteram_lock, flags);
return;
}
/* Yes, then remove the note at the tail index */
noteram_remove();
g_noteram_info.ni_overwrite = NOTERAM_MODE_OVERWRITE_OVERFLOW;
spin_unlock_irqrestore_wo_note(&g_noteram_lock, flags);
return;
}
/* Save the next byte at the head index */
/* Remove the note at the tail index , make sure there is enough space
*/
g_noteram_info.ni_buffer[head] = *buf++;
head = next;
notelen--;
do
{
noteram_remove();
remain = CONFIG_DRIVERS_NOTERAM_BUFSIZE - noteram_length();
}
while (remain < notelen);
}
g_noteram_info.ni_head = head;
head = g_noteram_info.ni_head;
space = CONFIG_DRIVERS_NOTERAM_BUFSIZE - head;
space = space < notelen ? space : notelen;
memcpy(g_noteram_info.ni_buffer + head, note, space);
memcpy(g_noteram_info.ni_buffer, buf + space, notelen - space);
g_noteram_info.ni_head = noteram_next(head, notelen);
spin_unlock_irqrestore_wo_note(&g_noteram_lock, flags);
}