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vmstat: precision issues in unitConvert()

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Fix conversion errors due to precision issues in function unitConvert

For example: unitConvert(98720620) will return 98720624, not 98720620.

Because we do (unsigned long)(float)98720620 in function unitConvert
and this is wrong! We should do (unsigned long)(double)98720620 here.

Signed-off-by: Craig Small <csmall@dropbear.xyz>

References:
 procps-ng/procps!75
This commit is contained in:
Qin Fandong
2023-01-18 17:02:53 +11:00
committed by Craig Small
parent 68e2c0fc53
commit 0a5ccbdd42
2 changed files with 3 additions and 2 deletions
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4
src/vmstat.c
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@ -336,8 +336,8 @@ static void new_header(void)
static unsigned long unitConvert(unsigned long size)
{
float cvSize;
cvSize = (float)size / dataUnit * ((statMode == SLABSTAT) ? 1 : 1024);
double cvSize;
cvSize = (double)size / dataUnit * ((statMode == SLABSTAT) ? 1 : 1024);
return ((unsigned long)cvSize);
}