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Message-Id: <20220907172712.61006-1-sj@kernel.org>
Date: Wed, 7 Sep 2022 17:27:12 +0000
From: SeongJae Park <sj@...nel.org>
To: unlisted-recipients:; (no To-header on input)
Cc: sj@...nel.org, akpm@...ux-foundation.org, damon@...ts.linux.dev,
linux-mm@...ck.org, linux-kernel@...r.kernel.org,
xhao@...ux.alibaba.com
Subject: Re: [PATCH] mm/damon: Remove duplicate get_monitoring_region() definitions
Hi Xin,
> In lru_sort.c and reclaim.c, they are all define get_monitoring_region()
s/define/defining/
> function, there is no need to define it separately.
Good point!
>
> BTW, this patch remove tow struct 'damon_lru_sort_ram_walk_arg' and
s/remove/removes/
s/tow/two/
> 'damon_reclaim_ram_walk_arg', though the two struct are removed, if we
> want to add more fields to these struct for other purposes later, it will
s/struct/structs/
> not too late for us to use them again.
> For example:
> struct damon_reclaim_ram_walk_arg {
> struct damon_addr_range raw_walk;
> xxx A;
> xxx B;
> }
> struct damon_lru_sort_ram_walk_arg {
> struct damon_addr_range raw_walk;
> xxx A;
> xxx B;
> }
I haven't read the below part yet, but seems you're gonna use 'struct
damon_addr_range' instead of 'struct damon_{reclai,lru_sort}_ram_walk_arg'.
And I think we have already discussed about this before:
https://lore.kernel.org/damon/20220818172322.51705-1-sj@kernel.org/
My point is, we might add some more fileds to 'struct damon_addr_range' in a
future, though it seems very unlikely at the moment. Sorry for not making my
opinion clear enough.
>
> Signed-off-by: Xin Hao <xhao@...ux.alibaba.com>
> ---
> mm/damon/lru_sort.c | 35 ++---------------------------------
> mm/damon/ops-common.c | 28 ++++++++++++++++++++++++++++
> mm/damon/ops-common.h | 1 +
> mm/damon/reclaim.c | 35 ++---------------------------------
> 4 files changed, 33 insertions(+), 66 deletions(-)
>
> diff --git a/mm/damon/lru_sort.c b/mm/damon/lru_sort.c
> index 9de6f00a71c5..5032d59d46e4 100644
> --- a/mm/damon/lru_sort.c
> +++ b/mm/damon/lru_sort.c
> @@ -13,6 +13,8 @@
> #include <linux/sched.h>
> #include <linux/workqueue.h>
>
> +#include "ops-common.h"
> +
> #ifdef MODULE_PARAM_PREFIX
> #undef MODULE_PARAM_PREFIX
> #endif
> @@ -257,39 +259,6 @@ module_param(nr_cold_quota_exceeds, ulong, 0400);
> static struct damon_ctx *ctx;
> static struct damon_target *target;
>
> -struct damon_lru_sort_ram_walk_arg {
> - unsigned long start;
> - unsigned long end;
> -};
> -
> -static int walk_system_ram(struct resource *res, void *arg)
> -{
> - struct damon_lru_sort_ram_walk_arg *a = arg;
> -
> - if (a->end - a->start < resource_size(res)) {
> - a->start = res->start;
> - a->end = res->end;
> - }
> - return 0;
> -}
> -
> -/*
> - * Find biggest 'System RAM' resource and store its start and end address in
> - * @start and @end, respectively. If no System RAM is found, returns false.
> - */
> -static bool get_monitoring_region(unsigned long *start, unsigned long *end)
> -{
> - struct damon_lru_sort_ram_walk_arg arg = {};
> -
> - walk_system_ram_res(0, ULONG_MAX, &arg, walk_system_ram);
> - if (arg.end <= arg.start)
> - return false;
> -
> - *start = arg.start;
> - *end = arg.end;
> - return true;
> -}
> -
> /* Create a DAMON-based operation scheme for hot memory regions */
> static struct damos *damon_lru_sort_new_hot_scheme(unsigned int hot_thres)
> {
> diff --git a/mm/damon/ops-common.c b/mm/damon/ops-common.c
> index b1335de200e7..01938f33038d 100644
> --- a/mm/damon/ops-common.c
> +++ b/mm/damon/ops-common.c
> @@ -172,3 +172,31 @@ int damon_hot_score(struct damon_ctx *c, struct damon_region *r,
>
> return hotness;
> }
> +
> +static inline int walk_system_ram(struct resource *res, void *arg)
> +{
> + struct damon_addr_range *a = arg;
> +
> + if (a->end - a->start < resource_size(res)) {
> + a->start = res->start;
> + a->end = res->end;
> + }
> + return 0;
> +}
> +
> +/*
> + * Find biggest 'System RAM' resource and store its start and end address in
> + * @start and @end, respectively. If no System RAM is found, returns false.
> + */
> +bool get_monitoring_region(unsigned long *start, unsigned long *end)
> +{
> + struct damon_addr_range arg = {};
> +
> + walk_system_ram_res(0, ULONG_MAX, &arg, walk_system_ram);
> + if (arg.end <= arg.start)
> + return false;
> +
> + *start = arg.start;
> + *end = arg.end;
> + return true;
> +}
'ops-common.c' is for code that common in monitoring operations
implementations. I'd prefer to have yet another source file for the DAMON
modules including reclaim and lru_sort, say, 'modules-common.c'.
Also, as 'get_monitoring_region()' is not a 'static' function anymore, let's
have a prefix to distinguish with other functions, say, 'damon_modules_'?
> diff --git a/mm/damon/ops-common.h b/mm/damon/ops-common.h
> index 52329ff361cd..e6f1c9b48042 100644
> --- a/mm/damon/ops-common.h
> +++ b/mm/damon/ops-common.h
> @@ -16,3 +16,4 @@ int damon_pageout_score(struct damon_ctx *c, struct damon_region *r,
> struct damos *s);
> int damon_hot_score(struct damon_ctx *c, struct damon_region *r,
> struct damos *s);
> +bool get_monitoring_region(unsigned long *start, unsigned long *end);
Let's move it to a dedicated source file, say, 'modules-common.h'
> diff --git a/mm/damon/reclaim.c b/mm/damon/reclaim.c
> index a7faf51b4bd4..20e83eee3c7d 100644
> --- a/mm/damon/reclaim.c
> +++ b/mm/damon/reclaim.c
> @@ -13,6 +13,8 @@
> #include <linux/sched.h>
> #include <linux/workqueue.h>
>
> +#include "ops-common.h"
> +
> #ifdef MODULE_PARAM_PREFIX
> #undef MODULE_PARAM_PREFIX
> #endif
> @@ -229,39 +231,6 @@ module_param(nr_quota_exceeds, ulong, 0400);
> static struct damon_ctx *ctx;
> static struct damon_target *target;
>
> -struct damon_reclaim_ram_walk_arg {
> - unsigned long start;
> - unsigned long end;
> -};
> -
> -static int walk_system_ram(struct resource *res, void *arg)
> -{
> - struct damon_reclaim_ram_walk_arg *a = arg;
> -
> - if (a->end - a->start < resource_size(res)) {
> - a->start = res->start;
> - a->end = res->end;
> - }
> - return 0;
> -}
> -
> -/*
> - * Find biggest 'System RAM' resource and store its start and end address in
> - * @start and @end, respectively. If no System RAM is found, returns false.
> - */
> -static bool get_monitoring_region(unsigned long *start, unsigned long *end)
> -{
> - struct damon_reclaim_ram_walk_arg arg = {};
> -
> - walk_system_ram_res(0, ULONG_MAX, &arg, walk_system_ram);
> - if (arg.end <= arg.start)
> - return false;
> -
> - *start = arg.start;
> - *end = arg.end;
> - return true;
> -}
> -
> static struct damos *damon_reclaim_new_scheme(void)
> {
> struct damos_watermarks wmarks = {
> --
> 2.31.0
Thanks,
SJ
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