From: Minghao Chi <chi.minghao@xxxxxxxxxx> In Documentation/admin-guide/sysctl/vm.rst:109 say: when 1 is written to the file, all zones are compacted such that free memory is available in contiguous blocks where possible. So limit the value of interface compact_memory to 1. Link: https://lore.kernel.org/all/ZAJwoXJCzfk1WIBx@xxxxxxxxxxxxxxxxxxxxxx/ Signed-off-by: Minghao Chi <chi.minghao@xxxxxxxxxx> Signed-off-by: Ye Xingchen <ye.xingchen@xxxxxxxxxx> --- include/linux/compaction.h | 1 + kernel/sysctl.c | 4 +++- 2 files changed, 4 insertions(+), 1 deletion(-) diff --git a/include/linux/compaction.h b/include/linux/compaction.h index 52a9ff65faee..caa24e33eeb1 100644 --- a/include/linux/compaction.h +++ b/include/linux/compaction.h @@ -81,6 +81,7 @@ static inline unsigned long compact_gap(unsigned int order) } #ifdef CONFIG_COMPACTION +extern int sysctl_compact_memory; extern unsigned int sysctl_compaction_proactiveness; extern int sysctl_compaction_handler(struct ctl_table *table, int write, void *buffer, size_t *length, loff_t *ppos); diff --git a/kernel/sysctl.c b/kernel/sysctl.c index c14552a662ae..67f70952f71a 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -2192,10 +2192,12 @@ static struct ctl_table vm_table[] = { #ifdef CONFIG_COMPACTION { .procname = "compact_memory", - .data = NULL, + .data = &sysctl_compact_memory, .maxlen = sizeof(int), .mode = 0200, .proc_handler = sysctl_compaction_handler, + .extra1 = SYSCTL_ONE, + .extra2 = SYSCTL_ONE, }, { .procname = "compaction_proactiveness", -- 2.25.1
