add extra free kbytes tunable

[firefly-linux-kernel-4.4.55.git] / kernel / sysctl.c

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index dc6858d6639ed022d65129bdbb869ff7bcc05789..81fe3bde9feefd9f4946d0c00faab936e54fff67 100644 (file)
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -104,6 +104,7 @@ extern char core_pattern[];
 extern unsigned int core_pipe_limit;
 #endif
 extern int pid_max;
+extern int extra_free_kbytes;
 extern int pid_max_min, pid_max_max;
 extern int percpu_pagelist_fraction;
 extern int compat_log;
@@ -1392,6 +1393,14 @@ static struct ctl_table vm_table[] = {
                .proc_handler   = min_free_kbytes_sysctl_handler,
                .extra1         = &zero,
        },
+       {
+               .procname       = "extra_free_kbytes",
+               .data           = &extra_free_kbytes,
+               .maxlen         = sizeof(extra_free_kbytes),
+               .mode           = 0644,
+               .proc_handler   = min_free_kbytes_sysctl_handler,
+               .extra1         = &zero,
+       },
        {
                .procname       = "percpu_pagelist_fraction",
                .data           = &percpu_pagelist_fraction,