From: Minghao Chi <chi.minghao@xxxxxxxxxx> Available only when CONFIG_COMPACTION is set. When 1 is written to the file, all zones are compacted such that free memory is available in contiguous blocks where possible. But echo others-parameter > compact_memory, this function will be triggered by writing parameters to the interface. Applied this patch, sh/$ echo 1.1 > /proc/sys/vm/compact_memory sh/$ sh: write error: Invalid argument The start and end time of printing triggering compact_memory. Link: https://lore.kernel.org/all/ZAJwoXJCzfk1WIBx@xxxxxxxxxxxxxxxxxxxxxx/ Signed-off-by: Minghao Chi <chi.minghao@xxxxxxxxxx> Signed-off-by: Ye Xingchen <ye.xingchen@xxxxxxxxxx> --- mm/compaction.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/mm/compaction.c b/mm/compaction.c index 5a9501e0ae01..2c9ecc4b9d23 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -2763,6 +2763,8 @@ int compaction_proactiveness_sysctl_handler(struct ctl_table *table, int write, return 0; } +/* The written value is actually unused, all memory is compacted */ +int sysctl_compact_memory; /* * This is the entry point for compacting all nodes via * /proc/sys/vm/compact_memory @@ -2770,8 +2772,16 @@ int compaction_proactiveness_sysctl_handler(struct ctl_table *table, int write, int sysctl_compaction_handler(struct ctl_table *table, int write, void *buffer, size_t *length, loff_t *ppos) { - if (write) + int ret; + + ret = proc_dointvec_minmax(table, write, buffer, length, ppos); + if (ret) + return ret; + if (write) { + pr_info("compact_nodes start\n"); compact_nodes(); + pr_info("compact_nodes end\n"); + } return 0; } -- 2.25.1
