From: Arun KS <arunks@codeaurora.org>
To: unlisted-recipients:; (no To-header on input)
Cc: keescook@chromium.org, khlebnikov@yandex-team.ru,
minchan@kernel.org, getarunks@gmail.com,
gregkh@linuxfoundation.org, akpm@linux-foundation.org,
mhocko@kernel.org, vbabka@suse.cz, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, Arun KS <arunks@codeaurora.org>
Subject: [PATCH v1 4/4] mm: Remove managed_page_count spinlock
Date: Fri, 26 Oct 2018 16:31:02 +0530 [thread overview]
Message-ID: <1540551662-26458-5-git-send-email-arunks@codeaurora.org> (raw)
In-Reply-To: <1540551662-26458-1-git-send-email-arunks@codeaurora.org>
Now totalram_pages and managed_pages are atomic varibles. No need
of managed_page_count spinlock.
Signed-off-by: Arun KS <arunks@codeaurora.org>
---
include/linux/mmzone.h | 6 ------
mm/page_alloc.c | 5 -----
2 files changed, 11 deletions(-)
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 597b0c7..aa960f6 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -428,12 +428,6 @@ struct zone {
* Write access to present_pages at runtime should be protected by
* mem_hotplug_begin/end(). Any reader who can't tolerant drift of
* present_pages should get_online_mems() to get a stable value.
- *
- * Read access to managed_pages should be safe because it's unsigned
- * long. Write access to zone->managed_pages and totalram_pages are
- * protected by managed_page_count_lock at runtime. Idealy only
- * adjust_managed_page_count() should be used instead of directly
- * touching zone->managed_pages and totalram_pages.
*/
atomic_long_t managed_pages;
unsigned long spanned_pages;
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index af832de..e29e78f 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -122,9 +122,6 @@
};
EXPORT_SYMBOL(node_states);
-/* Protect totalram_pages and zone->managed_pages */
-static DEFINE_SPINLOCK(managed_page_count_lock);
-
atomic_long_t _totalram_pages __read_mostly;
unsigned long totalreserve_pages __read_mostly;
unsigned long totalcma_pages __read_mostly;
@@ -7062,14 +7059,12 @@ static int __init cmdline_parse_movablecore(char *p)
void adjust_managed_page_count(struct page *page, long count)
{
- spin_lock(&managed_page_count_lock);
atomic_long_add(count, &page_zone(page)->managed_pages);
totalram_pages_add(count);
#ifdef CONFIG_HIGHMEM
if (PageHighMem(page))
totalhigh_pages_add(count);
#endif
- spin_unlock(&managed_page_count_lock);
}
EXPORT_SYMBOL(adjust_managed_page_count);
--
1.9.1
next prev parent reply other threads:[~2018-10-26 11:01 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-26 11:00 [PATCH v1 0/4]mm: convert totalram_pages, totalhigh_pages and managed pages to atomic Arun KS
2018-10-26 11:00 ` [PATCH v1 1/4] mm: Fix multiple evaluvations of totalram_pages and managed_pages Arun KS
2018-10-26 11:01 ` [PATCH v1 2/4] mm: Convert zone->managed_pages to atomic variable Arun KS
2018-10-26 11:01 ` [PATCH v1 3/4] mm: convert totalram_pages and totalhigh_pages variables to atomic Arun KS
[not found] ` <20181106141438.GQ27423@dhcp22.suse.cz>
2018-11-07 10:38 ` Michal Hocko
2018-10-26 11:01 ` Arun KS [this message]
[not found] ` <20181106141732.GR27423@dhcp22.suse.cz>
2018-11-07 10:36 ` [PATCH v1 4/4] mm: Remove managed_page_count spinlock Michal Hocko
2018-11-07 11:50 ` Vlastimil Babka
2018-11-06 5:38 ` [PATCH v1 0/4]mm: convert totalram_pages, totalhigh_pages and managed pages to atomic Arun KS
2018-11-06 8:17 ` Konstantin Khlebnikov
2018-11-06 8:30 ` Arun KS
2018-11-06 8:37 ` Konstantin Khlebnikov
2018-11-06 8:43 ` Arun KS
2018-11-07 7:02 ` Konstantin Khlebnikov
2018-11-07 8:50 ` Vlastimil Babka
2018-11-07 10:28 ` Michal Hocko
2018-11-07 10:39 ` Michal Hocko
2018-11-07 0:22 ` Andrew Morton
2018-11-07 6:19 ` Arun KS
-- strict thread matches above, loose matches on Subject: below --
2018-10-26 11:00 Arun KS
2018-10-26 11:00 ` [PATCH v1 4/4] mm: Remove managed_page_count spinlock Arun KS
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