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Message-ID: <20241211203951.764733-4-joshua.hahnjy@gmail.com>
Date: Wed, 11 Dec 2024 12:39:51 -0800
From: Joshua Hahn <joshua.hahnjy@...il.com>
To: shakeel.butt@...ux.dev
Cc: hannes@...xchg.org,
mhocko@...nel.org,
roman.gushchin@...ux.dev,
muchun.song@...ux.dev,
akpm@...ux-foundation.org,
sj@...nel.org,
cgroups@...r.kernel.org,
linux-mm@...ck.org,
linux-kernel@...r.kernel.org,
kernel-team@...a.com
Subject: [PATCH 3/3] memcg/hugetlb: Remove memcg hugetlb try-commit-cancel protocol
This patch fully removes the mem_cgroup_{try, commit, cancel}_charge
functions, as well as their hugetlb variants.
Signed-off-by: Joshua Hahn <joshua.hahnjy@...il.com>
Acked-by: Shakeel Butt <shakeel.butt@...ux.dev>
---
include/linux/memcontrol.h | 22 -------------
mm/memcontrol.c | 65 ++------------------------------------
2 files changed, 3 insertions(+), 84 deletions(-)
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index d1ee98dc3a38..e1a9998d8add 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -620,8 +620,6 @@ static inline bool mem_cgroup_below_min(struct mem_cgroup *target,
page_counter_read(&memcg->memory);
}
-void mem_cgroup_commit_charge(struct folio *folio, struct mem_cgroup *memcg);
-
int __mem_cgroup_charge(struct folio *folio, struct mm_struct *mm, gfp_t gfp);
/**
@@ -646,9 +644,6 @@ static inline int mem_cgroup_charge(struct folio *folio, struct mm_struct *mm,
return __mem_cgroup_charge(folio, mm, gfp);
}
-int mem_cgroup_hugetlb_try_charge(struct mem_cgroup *memcg, gfp_t gfp,
- long nr_pages);
-
int mem_cgroup_charge_hugetlb(struct folio* folio, gfp_t gfp);
int mem_cgroup_swapin_charge_folio(struct folio *folio, struct mm_struct *mm,
@@ -679,7 +674,6 @@ static inline void mem_cgroup_uncharge_folios(struct folio_batch *folios)
__mem_cgroup_uncharge_folios(folios);
}
-void mem_cgroup_cancel_charge(struct mem_cgroup *memcg, unsigned int nr_pages);
void mem_cgroup_replace_folio(struct folio *old, struct folio *new);
void mem_cgroup_migrate(struct folio *old, struct folio *new);
@@ -1137,23 +1131,12 @@ static inline bool mem_cgroup_below_min(struct mem_cgroup *target,
return false;
}
-static inline void mem_cgroup_commit_charge(struct folio *folio,
- struct mem_cgroup *memcg)
-{
-}
-
static inline int mem_cgroup_charge(struct folio *folio,
struct mm_struct *mm, gfp_t gfp)
{
return 0;
}
-static inline int mem_cgroup_hugetlb_try_charge(struct mem_cgroup *memcg,
- gfp_t gfp, long nr_pages)
-{
- return 0;
-}
-
static inline int mem_cgroup_swapin_charge_folio(struct folio *folio,
struct mm_struct *mm, gfp_t gfp, swp_entry_t entry)
{
@@ -1172,11 +1155,6 @@ static inline void mem_cgroup_uncharge_folios(struct folio_batch *folios)
{
}
-static inline void mem_cgroup_cancel_charge(struct mem_cgroup *memcg,
- unsigned int nr_pages)
-{
-}
-
static inline void mem_cgroup_replace_folio(struct folio *old,
struct folio *new)
{
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index c903e260a830..7ddbb2d12eb9 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2383,21 +2383,6 @@ int try_charge_memcg(struct mem_cgroup *memcg, gfp_t gfp_mask,
return 0;
}
-/**
- * mem_cgroup_cancel_charge() - cancel an uncommitted try_charge() call.
- * @memcg: memcg previously charged.
- * @nr_pages: number of pages previously charged.
- */
-void mem_cgroup_cancel_charge(struct mem_cgroup *memcg, unsigned int nr_pages)
-{
- if (mem_cgroup_is_root(memcg))
- return;
-
- page_counter_uncharge(&memcg->memory, nr_pages);
- if (do_memsw_account())
- page_counter_uncharge(&memcg->memsw, nr_pages);
-}
-
static void commit_charge(struct folio *folio, struct mem_cgroup *memcg)
{
VM_BUG_ON_FOLIO(folio_memcg_charged(folio), folio);
@@ -2411,18 +2396,6 @@ static void commit_charge(struct folio *folio, struct mem_cgroup *memcg)
folio->memcg_data = (unsigned long)memcg;
}
-/**
- * mem_cgroup_commit_charge - commit a previously successful try_charge().
- * @folio: folio to commit the charge to.
- * @memcg: memcg previously charged.
- */
-void mem_cgroup_commit_charge(struct folio *folio, struct mem_cgroup *memcg)
-{
- css_get(&memcg->css);
- commit_charge(folio, memcg);
- memcg1_commit_charge(folio, memcg);
-}
-
static inline void __mod_objcg_mlstate(struct obj_cgroup *objcg,
struct pglist_data *pgdat,
enum node_stat_item idx, int nr)
@@ -4510,7 +4483,9 @@ static int charge_memcg(struct folio *folio, struct mem_cgroup *memcg,
if (ret)
goto out;
- mem_cgroup_commit_charge(folio, memcg);
+ css_get(&memcg->css);
+ commit_charge(folio, memcg);
+ memcg1_commit_charge(folio, memcg);
out:
return ret;
}
@@ -4527,40 +4502,6 @@ int __mem_cgroup_charge(struct folio *folio, struct mm_struct *mm, gfp_t gfp)
return ret;
}
-/**
- * mem_cgroup_hugetlb_try_charge - try to charge the memcg for a hugetlb folio
- * @memcg: memcg to charge.
- * @gfp: reclaim mode.
- * @nr_pages: number of pages to charge.
- *
- * This function is called when allocating a huge page folio to determine if
- * the memcg has the capacity for it. It does not commit the charge yet,
- * as the hugetlb folio itself has not been obtained from the hugetlb pool.
- *
- * Once we have obtained the hugetlb folio, we can call
- * mem_cgroup_commit_charge() to commit the charge. If we fail to obtain the
- * folio, we should instead call mem_cgroup_cancel_charge() to undo the effect
- * of try_charge().
- *
- * Returns 0 on success. Otherwise, an error code is returned.
- */
-int mem_cgroup_hugetlb_try_charge(struct mem_cgroup *memcg, gfp_t gfp,
- long nr_pages)
-{
- /*
- * If hugetlb memcg charging is not enabled, do not fail hugetlb allocation,
- * but do not attempt to commit charge later (or cancel on error) either.
- */
- if (mem_cgroup_disabled() || !memcg ||
- !cgroup_subsys_on_dfl(memory_cgrp_subsys) || !memcg_accounts_hugetlb())
- return -EOPNOTSUPP;
-
- if (try_charge(memcg, gfp, nr_pages))
- return -ENOMEM;
-
- return 0;
-}
-
/**
* mem_cgroup_charge_hugetlb - charge the memcg for a hugetlb folio
* @folio: folio being charged
--
2.43.5
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