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Memory statistics split into Effective and Overhead

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This feature is intended mostly for checking that BIRD's allocation
strategies don't consume much memory space. There are some cases where
withdrawing routes in a specific order lead to memory fragmentation and
this output should give the user at least a notion of how much memory is
actually used for data storage and how much memory is "just allocated"
or used for overhead.

Also raising the "system allocator overhead estimation" from 8 to 16
bytes; it is probably even more. I've found 16 as a local minimum in
best scenarios among reachable machines. I couldn't find any reasonable
method to estimate this value when BIRD starts up.

This commit also fixes the inaccurate computation of memory overhead for
slabs where the "system allocater overhead estimation" was improperly
added to the size of mmap-ed memory.
This commit is contained in:
Maria Matejka
2021-11-27 00:21:12 +01:00
parent 644e9ca94e
commit f772afc525
5 changed files with 98 additions and 35 deletions
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12
lib/mempool.c
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@@ -45,7 +45,7 @@ struct linpool {
static void lp_free(resource *);
static void lp_dump(resource *);
static resource *lp_lookup(resource *, unsigned long);
static size_t lp_memsize(resource *r);
static struct resmem lp_memsize(resource *r);
static struct resclass lp_class = {
"LinPool",
@@ -287,7 +287,7 @@ lp_dump(resource *r)
m->total_large);
}
static size_t
static struct resmem
lp_memsize(resource *r)
{
linpool *m = (linpool *) r;
@@ -299,9 +299,11 @@ lp_memsize(resource *r)
for(c=m->first_large; c; c=c->next)
cnt++;
return ALLOC_OVERHEAD + sizeof(struct linpool) +
cnt * (ALLOC_OVERHEAD + sizeof(struct lp_chunk)) +
m->total + m->total_large;
return (struct resmem) {
.effective = m->total + m->total_large,
.overhead = ALLOC_OVERHEAD + sizeof(struct linpool) +
cnt * (ALLOC_OVERHEAD + sizeof(struct lp_chunk)),
};
}