From: xf2017140389@gmail.com
To: akpm@linux-foundation.org, christian@brauner.io
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
zhangcang@xiaomi.com, wangju@xiaomi.com, surenb@google.com,
fangzhirong@xiaomi.com, xiaofeng <xiaofeng5@xiaomi.com>
Subject: [PATCH] mm/madvise: break reclaim when lock race
Date: Tue, 7 Dec 2021 11:22:02 +0800 [thread overview]
Message-ID: <20211207032202.6022-1-xiaofeng5@xiaomi.com> (raw)
From: xiaofeng <xiaofeng5@xiaomi.com>
When the process_madvise() system call is being used, it takes mmap_lock and blocks the application from allocating memory, leading to unreasonable delays. This patchset aims to fix it.
Signed-off-by: xiaofeng <xiaofeng5@xiaomi.com>
---
mm/madvise.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/mm/madvise.c b/mm/madvise.c
index 8c927202bbe6..8f1e325873e0 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -322,6 +322,9 @@ static int madvise_cold_or_pageout_pte_range(pmd_t *pmd,
if (fatal_signal_pending(current))
return -EINTR;
+ if (mmap_lock_is_contended(mm))
+ return -EINTR;
+
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
if (pmd_trans_huge(*pmd)) {
pmd_t orig_pmd;
--
2.17.1
next reply other threads:[~2021-12-07 3:22 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-07 3:22 xf2017140389 [this message]
2021-12-07 17:04 ` Suren Baghdasaryan
2021-12-07 17:20 ` Matthew Wilcox
-- strict thread matches above, loose matches on Subject: below --
2021-12-06 14:55 xf2017140389
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