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Message-Id: <20230823170556.2281747-1-mjguzik@gmail.com>
Date: Wed, 23 Aug 2023 19:05:56 +0200
From: Mateusz Guzik <mjguzik@...il.com>
To: akpm@...ux-foundation.org
Cc: shakeelb@...gle.com, linux-kernel@...r.kernel.org,
linux-mm@...ck.org, Mateusz Guzik <mjguzik@...il.com>
Subject: [PATCH] mm: remove remnants of SPLIT_RSS_COUNTING
The feature got retired in f1a7941243c1 ("mm: convert mm's rss stats
into percpu_counter"), but the patch failed to fully clean it up.
Signed-off-by: Mateusz Guzik <mjguzik@...il.com>
---
fs/exec.c | 2 --
include/linux/mm.h | 8 --------
kernel/exit.c | 4 ----
kernel/fork.c | 4 ----
kernel/kthread.c | 1 -
mm/madvise.c | 5 +----
mm/memory.c | 2 --
7 files changed, 1 insertion(+), 25 deletions(-)
diff --git a/fs/exec.c b/fs/exec.c
index 1a827d55ba94..8d31d5fc658f 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -985,8 +985,6 @@ static int exec_mmap(struct mm_struct *mm)
tsk = current;
old_mm = current->mm;
exec_mm_release(tsk, old_mm);
- if (old_mm)
- sync_mm_rss(old_mm);
ret = down_write_killable(&tsk->signal->exec_update_lock);
if (ret)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 406ab9ea818f..08402054767a 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2606,14 +2606,6 @@ static inline void setmax_mm_hiwater_rss(unsigned long *maxrss,
*maxrss = hiwater_rss;
}
-#if defined(SPLIT_RSS_COUNTING)
-void sync_mm_rss(struct mm_struct *mm);
-#else
-static inline void sync_mm_rss(struct mm_struct *mm)
-{
-}
-#endif
-
#ifndef CONFIG_ARCH_HAS_PTE_SPECIAL
static inline int pte_special(pte_t pte)
{
diff --git a/kernel/exit.c b/kernel/exit.c
index edb50b4c9972..3cdbe797008f 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -539,7 +539,6 @@ static void exit_mm(void)
exit_mm_release(current, mm);
if (!mm)
return;
- sync_mm_rss(mm);
mmap_read_lock(mm);
mmgrab_lazy_tlb(mm);
BUG_ON(mm != current->active_mm);
@@ -829,9 +828,6 @@ void __noreturn do_exit(long code)
io_uring_files_cancel();
exit_signals(tsk); /* sets PF_EXITING */
- /* sync mm's RSS info before statistics gathering */
- if (tsk->mm)
- sync_mm_rss(tsk->mm);
acct_update_integrals(tsk);
group_dead = atomic_dec_and_test(&tsk->signal->live);
if (group_dead) {
diff --git a/kernel/fork.c b/kernel/fork.c
index d2e12b6d2b18..1ac1d850f7ab 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -2409,10 +2409,6 @@ __latent_entropy struct task_struct *copy_process(
p->io_uring = NULL;
#endif
-#if defined(SPLIT_RSS_COUNTING)
- memset(&p->rss_stat, 0, sizeof(p->rss_stat));
-#endif
-
p->default_timer_slack_ns = current->timer_slack_ns;
#ifdef CONFIG_PSI
diff --git a/kernel/kthread.c b/kernel/kthread.c
index 4fff7df17a68..0cf5582122b3 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -1470,7 +1470,6 @@ void kthread_unuse_mm(struct mm_struct *mm)
* clearing tsk->mm.
*/
smp_mb__after_spinlock();
- sync_mm_rss(mm);
local_irq_disable();
tsk->mm = NULL;
membarrier_update_current_mm(NULL);
diff --git a/mm/madvise.c b/mm/madvise.c
index 886f06066622..39bed9e4b08b 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -741,11 +741,8 @@ static int madvise_free_pte_range(pmd_t *pmd, unsigned long addr,
folio_mark_lazyfree(folio);
}
- if (nr_swap) {
- if (current->mm == mm)
- sync_mm_rss(mm);
+ if (nr_swap)
add_mm_counter(mm, MM_SWAPENTS, nr_swap);
- }
if (start_pte) {
arch_leave_lazy_mmu_mode();
pte_unmap_unlock(start_pte, ptl);
diff --git a/mm/memory.c b/mm/memory.c
index cdc4d4c1c858..b72d90ece7fe 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -474,8 +474,6 @@ static inline void add_mm_rss_vec(struct mm_struct *mm, int *rss)
{
int i;
- if (current->mm == mm)
- sync_mm_rss(mm);
for (i = 0; i < NR_MM_COUNTERS; i++)
if (rss[i])
add_mm_counter(mm, i, rss[i]);
--
2.39.2
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