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livepatch: Use kallsyms_on_each_match_symbol() to improve performance 

Based on the test results of kallsyms_on_each_match_symbol() and
kallsyms_on_each_symbol(), the average performance can be improved by
more than 1500 times.

Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
This commit is contained in:
Zhen Lei 2022-11-02 16:49:18 +08:00 committed by Luis Chamberlain
parent 4dc533e0f2
commit 9cb37357df
1 changed files with 19 additions and 1 deletions
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20
kernel/livepatch/core.c
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@ -153,6 +153,24 @@ static int klp_find_callback(void *data, const char *name,
return 0;
}
static int klp_match_callback(void *data, unsigned long addr)
{
struct klp_find_arg *args = data;
args->addr = addr;
args->count++;
/*
* Finish the search when the symbol is found for the desired position
* or the position is not defined for a non-unique symbol.
*/
if ((args->pos && (args->count == args->pos)) ||
(!args->pos && (args->count > 1)))
return 1;
return 0;
}
static int klp_find_object_symbol(const char *objname, const char *name,
unsigned long sympos, unsigned long *addr)
{
@ -167,7 +185,7 @@ static int klp_find_object_symbol(const char *objname, const char *name,
if (objname)
module_kallsyms_on_each_symbol(klp_find_callback, &args);
else
kallsyms_on_each_symbol(klp_find_callback, &args);
kallsyms_on_each_match_symbol(klp_match_callback, name, &args);
/*
* Ensure an address was found. If sympos is 0, ensure symbol is unique;