static enum vmpressure_levels vmpressure_calc_level(unsigned long scanned,
unsigned long reclaimed)
{
unsigned long scale = scanned + reclaimed;
unsigned long pressure = 0;
/*
* reclaimed can be greater than scanned for things such as reclaimed
* slab pages. shrink_node() just adds reclaimed pages without a
* related increment to scanned pages.
*/
if (reclaimed >= scanned)
goto out;
/*
* We calculate the ratio (in percents) of how many pages were
* scanned vs. reclaimed in a given time frame (window). Note that
* time is in VM reclaimer's "ticks", i.e. number of pages
* scanned. This makes it possible to set desired reaction time
* and serves as a ratelimit.
*/
pressure = scale - (reclaimed * scale / scanned);
pressure = pressure * 100 / scale;
out:
pr_debug("%s: %3lu (s: %lu r: %lu)\n", __func__, pressure,
scanned, reclaimed);
return vmpressure_level(pressure);
}
static enum vmpressure_levels vmpressure_calc_level(unsigned long scanned,
unsigned long reclaimed)
{
unsigned long scale = scanned + reclaimed;
unsigned long pressure;
/*
* We calculate the ratio (in percents) of how many pages were
* scanned vs. reclaimed in a given time frame (window). Note that
* time is in VM reclaimer's "ticks", i.e. number of pages
* scanned. This makes it possible to set desired reaction time
* and serves as a ratelimit.
*/
pressure = scale - (reclaimed * scale / scanned);
pressure = pressure * 100 / scale;
pr_debug("%s: %3lu (s: %lu r: %lu)\n", __func__, pressure,
scanned, reclaimed);
return vmpressure_level(pressure);
}
