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MEDIUM: proxy: no longer allocate the default-server entry by default

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The default-server entry used to always be allocated. Now we'll postpone
its allocation for the first time we need it, i.e. during a "default-server"
directive, or when inheriting a defaults section which has one. The memory
savings are significant, on a large configuration with 100k backends and
no default-server directive, the memory usage dropped from 800MB RSS to
420MB (380 MB saved). It should be possible to also address configs using
default-server by releasing this entry when leaving the proxy section,
which is not done yet.
This commit is contained in:
Willy Tarreau 2025-07-11 08:40:17 +02:00
parent 76828d4120
commit 49a619acae
1 changed files with 17 additions and 11 deletions
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28
src/proxy.c
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@ -1685,16 +1685,6 @@ int setup_new_proxy(struct proxy *px, const char *name, unsigned int cap, char *
{
init_new_proxy(px);
/* allocate the default server section */
px->defsrv = calloc(1, sizeof(*px->defsrv));
if (!px->defsrv) {
memprintf(errmsg, "out of memory");
goto fail;
}
px->defsrv->id = "default-server";
srv_settings_init(px->defsrv);
if (name) {
px->id = strdup(name);
if (!px->id) {
@ -1807,8 +1797,24 @@ static int proxy_defproxy_cpy(struct proxy *curproxy, const struct proxy *defpro
struct eb32_node *node;
/* set default values from the specified default proxy */
if (curproxy->defsrv)
if (defproxy->defsrv) {
if (!curproxy->defsrv) {
/* there's a default-server in the defaults proxy but
* none allocated yet in the current proxy so we have
* to allocate and pre-initialize it right now.
*/
curproxy->defsrv = calloc(1, sizeof(*curproxy->defsrv));
if (!curproxy->defsrv) {
memprintf(errmsg, "proxy '%s': out of memory allocating default-server", curproxy->id);
return 1;
}
curproxy->defsrv->id = "default-server";
srv_settings_init(curproxy->defsrv);
}
srv_settings_cpy(curproxy->defsrv, defproxy->defsrv, 0);
}
curproxy->flags = (defproxy->flags & PR_FL_DISABLED); /* Only inherit from disabled flag */
curproxy->options = defproxy->options;