[PATCH] malloc: fix large tcache code to check for exact size match

[Wilco Dijkstra]

Hi Dev,

@@ -3280,6 +3280,8 @@ tcache_location_large (size_t nb, size_t tc_idx, bool *mangled)
*mangled = true;
}
+ if (te != NULL && chunksize (mem2chunk (te)) != nb)
+ return NULL;
return tep;
 }

> But this gives a huge regression, any idea why is that? I thought checking
> this condition in tcache_location_large itself should be the fastest.

That is because it is used for both inserts and deletes. If you only allow it to insert if
it finds an indentical sized block, you will never insert anything.

Cheers,
Wilco