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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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3
src/topology/channel.c
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@ -138,7 +138,8 @@ int tplg_parse_channel(snd_tplg_t *tplg, snd_config_t *cfg,
int tplg_save_channels(snd_tplg_t *tplg ATTRIBUTE_UNUSED,
struct snd_soc_tplg_channel *channel,
unsigned int count, char **dst, const char *pfx)
unsigned int count, struct tplg_buf *dst,
const char *pfx)
{
struct snd_soc_tplg_channel *c;
const char *s;