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mm/damon/reclaim: support addr_unit for DAMON_RECLAIM

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Implement a sysfs file to expose addr_unit for DAMON_RECLAIM users. 
During parameter application, use the configured addr_unit parameter to
perform the necessary initialization.  Similar to the core layer, prevent
setting addr_unit to zero.

It is worth noting that when monitor_region_start and monitor_region_end
are unset (i.e., 0), their values will later be set to biggest_system_ram.
At that point, addr_unit may not be the default value 1.  Although we
could divide the biggest_system_ram value by addr_unit, changing addr_unit
without setting monitor_region_start/end should be considered a user
misoperation.  And biggest_system_ram is only within the 0~ULONG_MAX
range, system can clearly work correctly with addr_unit=1.  Therefore, if
monitor_region_start/end are unset, always silently reset addr_unit to 1.

Link: https://lkml.kernel.org/r/20250910113221.1065764-3-yanquanmin1@huawei.com
Signed-off-by: Quanmin Yan <yanquanmin1@huawei.com>
Reviewed-by: SeongJae Park <sj@kernel.org>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: ze zuo <zuoze1@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Quanmin Yan
2025-09-10 19:32:21 +08:00
committed by Andrew Morton
parent 2e0fe9245d
commit 7db551fcfb
1 changed files with 40 additions and 0 deletions
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40
mm/damon/reclaim.c
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@@ -128,6 +128,13 @@ module_param(monitor_region_start, ulong, 0600);
static unsigned long monitor_region_end __read_mostly;
module_param(monitor_region_end, ulong, 0600);
/*
* Scale factor for DAMON_RECLAIM to ops address conversion.
*
* This parameter must not be set to 0.
*/
static unsigned long addr_unit __read_mostly = 1;
/*
* Skip anonymous pages reclamation.
*
@@ -194,6 +201,15 @@ static int damon_reclaim_apply_parameters(void)
if (err)
return err;
/*
* If monitor_region_start/end are unset, always silently
* reset addr_unit to 1.
*/
if (!monitor_region_start && !monitor_region_end)
addr_unit = 1;
param_ctx->addr_unit = addr_unit;
param_ctx->min_sz_region = max(DAMON_MIN_REGION / addr_unit, 1);
if (!damon_reclaim_mon_attrs.aggr_interval) {
err = -EINVAL;
goto out;
@@ -294,6 +310,30 @@ static int damon_reclaim_turn(bool on)
return damon_call(ctx, &call_control);
}
static int damon_reclaim_addr_unit_store(const char *val,
const struct kernel_param *kp)
{
unsigned long input_addr_unit;
int err = kstrtoul(val, 0, &input_addr_unit);
if (err)
return err;
if (!input_addr_unit)
return -EINVAL;
addr_unit = input_addr_unit;
return 0;
}
static const struct kernel_param_ops addr_unit_param_ops = {
.set = damon_reclaim_addr_unit_store,
.get = param_get_ulong,
};
module_param_cb(addr_unit, &addr_unit_param_ops, &addr_unit, 0600);
MODULE_PARM_DESC(addr_unit,
"Scale factor for DAMON_RECLAIM to ops address conversion (default: 1)");
static int damon_reclaim_enabled_store(const char *val,
const struct kernel_param *kp)
{