diff options
Diffstat (limited to 'kernel/power/hibernate.c')
| -rw-r--r-- | kernel/power/hibernate.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c index 9216e3b91d3b..1f1f30cca573 100644 --- a/kernel/power/hibernate.c +++ b/kernel/power/hibernate.c @@ -381,6 +381,23 @@ static int create_image(int platform_mode) return error; } +static void shrink_shmem_memory(void) +{ + struct sysinfo info; + unsigned long nr_shmem_pages, nr_freed_pages; + + si_meminfo(&info); + nr_shmem_pages = info.sharedram; /* current page count used for shmem */ + /* + * The intent is to reclaim all shmem pages. Though shrink_all_memory() can + * only reclaim about half of them, it's enough for creating the hibernation + * image. + */ + nr_freed_pages = shrink_all_memory(nr_shmem_pages); + pr_debug("requested to reclaim %lu shmem pages, actually freed %lu pages\n", + nr_shmem_pages, nr_freed_pages); +} + /** * hibernation_snapshot - Quiesce devices and create a hibernation image. * @platform_mode: If set, use platform driver to prepare for the transition. @@ -422,6 +439,15 @@ int hibernation_snapshot(int platform_mode) goto Thaw; } + /* + * Device drivers may move lots of data to shmem in dpm_prepare(). The shmem + * pages will use lots of system memory, causing hibernation image creation + * fail due to insufficient free memory. + * This call is to force flush the shmem pages to swap disk and reclaim + * the system memory so that image creation can succeed. + */ + shrink_shmem_memory(); + console_suspend_all(); error = dpm_suspend(PMSG_FREEZE); |