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Make enable of disk cache statistics code configurable.

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* configure.ac: --enable-cache-stats added.
	* config.h.in (DISK_CACHE_STATS): New define.
	* grub-core/Makefile.core.def (cacheinfo): New command.
	* include/grub/disk.h(grub_disk_cache_get_performance): New function.
	* grub-core/commands/cacheinfo.c: New file.
	* grub-core/commands/minicmd.c (grub_rescue_cmd_info): Updated and
	moved to cacheinfo.c.
	* grub-core/kern/disk.c: Use DISK_CACHE_STATS to disable disk cache
	debug code.
	* include/grub/disk.h: Likewise.
This commit is contained in:
Szymon Janc 2010-10-06 19:57:01 +02:00
parent a61499a1c3
commit c5dc16905a
8 changed files with 106 additions and 23 deletions
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58
grub-core/commands/cacheinfo.c Normal file
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/* cacheinfo.c - disk cache statistics */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2008,2010 Free Software Foundation, Inc.
*
* GRUB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/dl.h>
#include <grub/misc.h>
#include <grub/command.h>
#include <grub/i18n.h>
#include <grub/disk.h>
static grub_err_t
grub_rescue_cmd_info (struct grub_command *cmd __attribute__ ((unused)),
int argc __attribute__ ((unused)),
char *argv[] __attribute__ ((unused)))
{
unsigned long hits, misses;
grub_disk_cache_get_performance (&hits, &misses);
grub_printf ("Disk cache: hits = %lu, misses = %lu ", hits, misses);
if (hits + misses)
{
unsigned long ratio = hits * 10000 / (hits + misses);
grub_printf ("(%lu.%lu%%)\n", ratio / 100, ratio % 100);
}
else
grub_printf ("(N/A)\n");
return 0;
}
static grub_command_t cmd_cacheinfo;
GRUB_MOD_INIT(cacheinfo)
{
cmd_cacheinfo =
grub_register_command ("cacheinfo", grub_rescue_cmd_info,
0, N_("Get disk cache info."));
}
GRUB_MOD_FINI(cacheinfo)
{
grub_unregister_command (cmd_cacheinfo);
}