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Replaces commit 44e3708cdb

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Thanks to ichelm610x for the patch.
I just added memoization to reduce the impact of the many system calls.
(cherry picked from commit 1eedf2633b)
This commit is contained in:
Cesare Tirabassi 2010-01-31 20:57:02 +01:00
parent da510d34a6
commit d2ce1d2909
1 changed files with 45 additions and 5 deletions
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50
src/linux.c
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@ -2246,6 +2246,49 @@ const char *get_disk_protect_queue(const char *disk)
return (state > 0) ? "frozen" : "free ";
}
typedef struct DEV_LIST_TYPE
{
char *dev_name;
int memoized;
struct DEV_LIST_TYPE *next;
} DEV_LIST, *DEV_LIST_PTR;
/* Same as sf #2942117 but memoized using a linked list */
int is_disk(char *dev)
{
char syspath[PATH_MAX];
char *slash;
static DEV_LIST_PTR dev_head = NULL;
DEV_LIST_PTR dev_cur, dev_last;
dev_cur = dev_head;
while (dev_cur) {
if (strcmp(dev_cur->dev_name, dev) == 0)
return dev_cur->memoized;
dev_last = dev_cur;
dev_cur = dev_cur->next;
}
dev_cur = (DEV_LIST_PTR)malloc(sizeof(DEV_LIST));
dev_cur->dev_name = (char *)malloc((strlen(dev)+1)*sizeof(char));
strcpy(dev_cur->dev_name,dev);
dev_cur->next = NULL;
while ((slash = strchr(dev, '/')))
*slash = '!';
snprintf(syspath, sizeof(syspath), "/sys/block/%s", dev);
dev_cur->memoized = !(access(syspath, F_OK));
if (dev_head)
dev_last->next = dev_cur;
else
dev_head = dev_cur;
return dev_cur->memoized;
}
void update_diskio(void)
{
FILE *fp;
@ -2256,7 +2299,6 @@ void update_diskio(void)
struct diskio_stat *cur;
unsigned int reads, writes;
unsigned int total_reads = 0, total_writes = 0;
size_t len_devbuf;
stats.current = 0;
stats.current_read = 0;
@ -2277,10 +2319,8 @@ void update_diskio(void)
* XXX: ignore devices which are part of a SW RAID (MD_MAJOR) */
if (col_count == 5 && major != LVM_BLK_MAJOR && major != NBD_MAJOR
&& major != RAMDISK_MAJOR && major != LOOP_MAJOR) {
/* If the last character of the device is a digit we assume
* it is a subdevice (needed for kernel > 2.6.31) */
len_devbuf = strlen(devbuf);
if ((len_devbuf > 0) && !isdigit(devbuf[len_devbuf-1])) {
/* check needed for kernel >= 2.6.31, see sf #2942117 */
if (is_disk(devbuf)) {
total_reads += reads;
total_writes += writes;
}