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filter-persistent: convert to use radix_tree

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Convert the persisten filter to use more memory compact radix_tree as
dm_hash is bound to preallocated number of slots and stores whole
key together with value.
This commit is contained in:
Zdenek Kabelac 2024-06-02 22:50:11 +02:00
parent ed440367b9
commit 4b126fd953
1 changed files with 15 additions and 13 deletions
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28
lib/filters/filter-persistent.c
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@ -14,12 +14,13 @@
*/
#include "base/memory/zalloc.h"
#include "base/data-struct/radix-tree.h"
#include "lib/misc/lib.h"
#include "lib/filters/filter.h"
#include "lib/config/config.h"
struct pfilter {
struct dm_hash_table *devices;
struct radix_tree *devices;
struct dev_filter *real;
struct dev_types *dt;
};
@ -56,9 +57,9 @@ static int _bad_device;
static int _init_hash(struct pfilter *pf)
{
if (pf->devices)
dm_hash_destroy(pf->devices);
radix_tree_destroy(pf->devices);
if (!(pf->devices = dm_hash_create(8191)))
if (!(pf->devices = radix_tree_create(NULL, NULL)))
return_0;
return 1;
@ -70,10 +71,10 @@ static void _persistent_filter_wipe(struct cmd_context *cmd, struct dev_filter *
struct dm_str_list *sl;
if (!dev) {
dm_hash_wipe(pf->devices);
_init_hash(pf);
} else {
dm_list_iterate_items(sl, &dev->aliases)
dm_hash_remove(pf->devices, sl->str);
radix_tree_remove(pf->devices, sl->str, strlen(sl->str));
}
}
@ -83,6 +84,7 @@ static int _lookup_p(struct cmd_context *cmd, struct dev_filter *f, struct devic
void *l;
struct dm_str_list *sl;
int pass = 1;
const char *devname = dev_name(dev);
if (use_filter_name && strcmp(f->name, use_filter_name))
return pf->real->passes_filter(cmd, pf->real, dev, use_filter_name);
@ -93,17 +95,17 @@ static int _lookup_p(struct cmd_context *cmd, struct dev_filter *f, struct devic
return 0;
}
l = dm_hash_lookup(pf->devices, dev_name(dev));
l = radix_tree_lookup_ptr(pf->devices, devname, strlen(devname));
/* Cached bad, skip dev */
if (l == PF_BAD_DEVICE) {
log_debug_devs("%s: filter cache skipping (cached bad)", dev_name(dev));
log_debug_devs("%s: filter cache skipping (cached bad).", devname);
return 0;
}
/* Cached good, use dev */
if (l == PF_GOOD_DEVICE) {
log_debug_devs("%s: filter cache using (cached good)", dev_name(dev));
log_debug_devs("%s: filter cache using (cached good).", devname);
return 1;
}
@ -121,17 +123,17 @@ static int _lookup_p(struct cmd_context *cmd, struct dev_filter *f, struct devic
} else if (pass == 1) {
l = PF_GOOD_DEVICE;
} else {
log_error("Ignore invalid filter result %d %s", pass, dev_name(dev));
log_error("Ignore invalid filter result %d %s.", pass, devname);
pass = 1;
/* don't cache invalid result */
goto out;
}
if (!dev->filtered_flags) /* skipping reason already logged by filter */
log_debug_devs("filter caching %s %s", pass ? "good" : "bad", dev_name(dev));
log_debug_devs("filter caching %s %s.", pass ? "good" : "bad", devname);
dm_list_iterate_items(sl, &dev->aliases)
if (!dm_hash_insert(pf->devices, sl->str, l)) {
if (!radix_tree_insert_ptr(pf->devices, sl->str, strlen(sl->str), l)) {
log_error("Failed to hash alias to filter.");
return 0;
}
@ -147,7 +149,7 @@ static void _persistent_destroy(struct dev_filter *f)
if (f->use_count)
log_error(INTERNAL_ERROR "Destroying persistent filter while in use %u times.", f->use_count);
dm_hash_destroy(pf->devices);
radix_tree_destroy(pf->devices);
pf->real->destroy(pf->real);
free(pf);
free(f);
@ -190,7 +192,7 @@ struct dev_filter *persistent_filter_create(struct dev_types *dt, struct dev_fil
bad:
if (pf->devices)
dm_hash_destroy(pf->devices);
radix_tree_destroy(pf->devices);
free(pf);
free(f);
return NULL;