Messages in this thread Patch in this message | | | From | xf2017140389@gmail ... | Subject | [PATCH] mm/madvise: break reclaim when lock race | Date | Mon, 6 Dec 2021 22:55:16 +0800 |
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From: xiaofeng <xiaofeng5@xiaomi.com>
In Android phones, the recycling thread is likely to hold the mmap_lock to reclaim the memory of the application When the top-App is switched to the background. Once the user switches the application to the top during the recycling process, there is a high possibility that the memory will be allocated due to the inability to obtain the lock, which may cause lag or other problem.
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
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