52 lines
1.7 KiB
Diff
52 lines
1.7 KiB
Diff
From e3afdec765f5277bbd3b2196e0facb8b428fb9d2 Mon Sep 17 00:00:00 2001
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From: Steven Barrett <steven@liquorix.net>
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Date: Mon, 5 Sep 2022 11:35:20 -0500
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Subject: ZEN: INTERACTIVE: mm/swap: Disable swap-in readahead
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Per an [issue][1] on the chromium project, swap-in readahead causes more
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jank than not. This might be caused by poor optimization on the
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swapping code, or the fact under memory pressure, we're pulling in pages
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we don't need, causing more swapping.
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Either way, this is mainline/upstream to Chromium, and ChromeOS
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developers care a lot about system responsiveness. Lets implement the
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same change so Zen Kernel users benefit.
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[1]: https://bugs.chromium.org/p/chromium/issues/detail?id=263561
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---
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init/Kconfig | 1 +
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mm/swap.c | 5 +++++
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2 files changed, 6 insertions(+)
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--- a/init/Kconfig
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+++ b/init/Kconfig
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@@ -183,6 +183,7 @@ config ZEN_INTERACTIVE
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Background-reclaim hugepages...: no -> yes
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Compact unevictable............: yes -> no
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Watermark boost factor.........: 1.5 -> 0
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+ Swap-in readahead..............: 3 -> 0
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--- EEVDF CPU Scheduler --------------------------------
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--- a/mm/swap.c
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+++ b/mm/swap.c
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@@ -1091,6 +1091,10 @@ static const struct ctl_table swap_sysct
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*/
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void __init swap_setup(void)
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{
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+#ifdef CONFIG_ZEN_INTERACTIVE
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+ /* Only swap-in pages requested, avoid readahead */
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+ page_cluster = 0;
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+#else
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unsigned long megs = totalram_pages() >> (20 - PAGE_SHIFT);
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/* Use a smaller cluster for small-memory machines */
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@@ -1102,6 +1106,7 @@ void __init swap_setup(void)
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* Right now other parts of the system means that we
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* _really_ don't want to cluster much more
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*/
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+#endif
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register_sysctl_init("vm", swap_sysctl_table);
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}
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