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PM: hibernate: Add more logging on hibernation failure

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Hibernation fails when the kernel cannot allocate enough memory
to copy all pages of RAM in use.

Ensure that the failure reason is clearly logged, and clearly
attributable to the hibernation module.

Signed-off-by: Luigi Semenzato <semenzato@google.com>
[ rjw: Subject & changelog ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Luigi Semenzato
2020-01-02 15:19:40 -08:00
committed by Rafael J. Wysocki
parent 809ed78a83
commit 7a7b99bf80
2 changed files with 27 additions and 20 deletions
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24
kernel/power/snapshot.c
View File

@@ -8,7 +8,7 @@
* Copyright (C) 2006 Rafael J. Wysocki <rjw@sisk.pl>
*/
#define pr_fmt(fmt) "PM: " fmt
#define pr_fmt(fmt) "PM: hibernation: " fmt
#include <linux/version.h>
#include <linux/module.h>
@@ -1703,16 +1703,20 @@ int hibernate_preallocate_memory(void)
ktime_t start, stop;
int error;
pr_info("Preallocating image memory... ");
pr_info("Preallocating image memory\n");
start = ktime_get();
error = memory_bm_create(&orig_bm, GFP_IMAGE, PG_ANY);
if (error)
if (error) {
pr_err("Cannot allocate original bitmap\n");
goto err_out;
}
error = memory_bm_create(&copy_bm, GFP_IMAGE, PG_ANY);
if (error)
if (error) {
pr_err("Cannot allocate copy bitmap\n");
goto err_out;
}
alloc_normal = 0;
alloc_highmem = 0;
@@ -1802,8 +1806,11 @@ int hibernate_preallocate_memory(void)
alloc -= pages;
pages += pages_highmem;
pages_highmem = preallocate_image_highmem(alloc);
if (pages_highmem < alloc)
if (pages_highmem < alloc) {
pr_err("Image allocation is %lu pages short\n",
alloc - pages_highmem);
goto err_out;
}
pages += pages_highmem;
/*
* size is the desired number of saveable pages to leave in
@@ -1834,13 +1841,12 @@ int hibernate_preallocate_memory(void)
out:
stop = ktime_get();
pr_cont("done (allocated %lu pages)\n", pages);
pr_info("Allocated %lu pages for shapshot\n", pages);
swsusp_show_speed(start, stop, pages, "Allocated");
return 0;
err_out:
pr_cont("\n");
swsusp_free();
return -ENOMEM;
}
@@ -1974,7 +1980,7 @@ asmlinkage __visible int swsusp_save(void)
{
unsigned int nr_pages, nr_highmem;
pr_info("Creating hibernation image:\n");
pr_info("Creating image:\n");
drain_local_pages(NULL);
nr_pages = count_data_pages();
@@ -2008,7 +2014,7 @@ asmlinkage __visible int swsusp_save(void)
nr_copy_pages = nr_pages;
nr_meta_pages = DIV_ROUND_UP(nr_pages * sizeof(long), PAGE_SIZE);
pr_info("Hibernation image created (%d pages copied)\n", nr_pages);
pr_info("Image created (%d pages copied)\n", nr_pages);
return 0;
}