From ea215c9a1040c12446c3b32887255680fb719fe4 Mon Sep 17 00:00:00 2001 From: Huaisheng Ye Date: Mon, 16 Jan 2023 14:23:47 +0800 Subject: [PATCH] UPSTREAM: mm/damon/core: skip apply schemes if empty Sometimes there is no scheme in damon's context, for example just use damo record to monitor workload's data access pattern. If current damon context doesn't have any scheme in the list, kdamond has no need to iterate over list of all targets and regions but do nothing. So, skip apply schemes when ctx->schemes is empty. Link: https://lkml.kernel.org/r/20230116062347.1148553-1-huaisheng.ye@intel.com Signed-off-by: Huaisheng Ye Reviewed-by: SeongJae Park Signed-off-by: Andrew Morton (cherry picked from commit 64517d6e1291b5e942b00c53674ecf33f918313f) Bug: 300502883 Change-Id: Ic76ca90c85dbb24205b17dd914f91a8dd4cf7345 Signed-off-by: cui yangpei --- mm/damon/core.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/mm/damon/core.c b/mm/damon/core.c index ceec75b88ef9..f338691e4591 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -1230,7 +1230,8 @@ static int kdamond_fn(void *data) if (ctx->callback.after_aggregation && ctx->callback.after_aggregation(ctx)) break; - kdamond_apply_schemes(ctx); + if (!list_empty(&ctx->schemes)) + kdamond_apply_schemes(ctx); kdamond_reset_aggregated(ctx); kdamond_split_regions(ctx); if (ctx->ops.reset_aggregated)