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parisc: unwind - optimise linked-list searches for modules

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Having many dozens of modules, the searches down the linked
list of sections would dominate the lookup time, dwarfing
any savings from the binary search within the section.

A simple move-to-front optimisation exploits the commonality
of the code paths taken, and in simple real-world tests
on other architectures reduced the number of steps in the
search to barely more than 1.

Signed-off-by: Phil Carmody <ext-phil.2.carmody@nokia.com>
Signed-off-by: Kyle McMartin <kyle@redhat.com>
This commit is contained in:
Phil Carmody 2010-09-10 13:47:59 +03:00 committed by Kyle McMartin
parent f720817700
commit b1b1d4a6f2
1 changed files with 4 additions and 1 deletions
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arch/parisc/kernel/unwind.c
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@ -80,8 +80,11 @@ find_unwind_entry(unsigned long addr)
if (addr >= table->start &&
addr <= table->end)
e = find_unwind_entry_in_table(table, addr);
if (e)
if (e) {
/* Move-to-front to exploit common traces */
list_move(&table->list, &unwind_tables);
break;
}
}
return e;