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topology: improve the printf buffer management

Browse source 
The commit d04e72c9a5 introduced
the dynamic printf buffer allocation for each tplg_save_printf()
call.

Introduce 'struct tplg_buf' which carries extra information about
the temporary printf buffer and the destination buffer to save allocation
requests.

The printf buffer is also allocated using 1024 bytes chunks.

A comparison between 'alloc everyting' and 'cache+chunk alloc' for the
random picked topology file:

  1: 18,620 allocs, 18,620 frees, 7,239,688 bytes allocated
  2: 12,490 allocs, 12,490 frees, 962,568 bytes allocated

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Jaroslav Kysela 2020-08-31 19:44:46 +02:00
parent ab73253924
commit 472ab5db67
9 changed files with 130 additions and 97 deletions
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5
src/topology/dapm.c
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@ -416,7 +416,8 @@ int tplg_parse_dapm_graph(snd_tplg_t *tplg, snd_config_t *cfg,
}
/* save DAPM graph */
int tplg_save_dapm_graph(snd_tplg_t *tplg, int index, char **dst, const char *pfx)
int tplg_save_dapm_graph(snd_tplg_t *tplg, int index,
struct tplg_buf *dst, const char *pfx)
{
struct snd_soc_tplg_dapm_graph_elem *route;
struct list_head *pos;
@ -669,7 +670,7 @@ int tplg_parse_dapm_widget(snd_tplg_t *tplg,
/* save DAPM widget */
int tplg_save_dapm_widget(snd_tplg_t *tplg ATTRIBUTE_UNUSED,
struct tplg_elem *elem,
char **dst, const char *pfx)
struct tplg_buf *dst, const char *pfx)
{
struct snd_soc_tplg_dapm_widget *widget = elem->widget;
const char *s;