Routines that together provide the user with debugging info via
/proc/suspend2/debug_info.
Signed-off-by: Nigel Cunningham <[email protected]>
kernel/power/suspend.c | 100 ++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 100 insertions(+), 0 deletions(-)
diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c
index 8ef1200..769ae96 100644
--- a/kernel/power/suspend.c
+++ b/kernel/power/suspend.c
@@ -369,3 +369,103 @@ abort_reloading_pagedir_two:
}
+static int io_MB_per_second(int read_write)
+{
+ if (!suspend_io_time[read_write][1])
+ return 0;
+
+ return MB((unsigned long) suspend_io_time[read_write][0]) * HZ /
+ suspend_io_time[read_write][1];
+}
+
+/* get_debug_info
+ * Functionality: Store debug info in a buffer.
+ * Called from: suspend2_try_suspend.
+ */
+#define SNPRINTF(a...) len += snprintf_used(debug_info_buffer + len, \
+ PAGE_SIZE - len - 1, ## a)
+static int get_suspend_debug_info(void)
+{
+ int len = 0;
+ if (!debug_info_buffer) {
+ debug_info_buffer = (char *) get_zeroed_page(GFP_ATOMIC);
+ if (!debug_info_buffer) {
+ printk("Error! Unable to allocate buffer for"
+ "software suspend debug info.\n");
+ return 0;
+ }
+ }
+
+ SNPRINTF("Suspend2 debugging info:\n");
+ SNPRINTF("- SUSPEND core : %s\n", SUSPEND_CORE_VERSION);
+ SNPRINTF("- Kernel Version : %s\n", UTS_RELEASE);
+ SNPRINTF("- Compiler vers. : %d.%d\n", __GNUC__, __GNUC_MINOR__);
+ SNPRINTF("- Attempt number : %d\n", nr_suspends);
+ SNPRINTF("- Parameters : %ld %ld %ld %d %d %ld\n",
+ suspend_result,
+ suspend_action,
+ suspend_debug_state,
+ suspend_default_console_level,
+ image_size_limit,
+ suspend_powerdown_method);
+ SNPRINTF("- Overall expected compression percentage: %d.\n",
+ 100 - suspend_expected_compression_ratio());
+ len+= suspend_print_module_debug_info(debug_info_buffer + len,
+ PAGE_SIZE - len - 1);
+ if (suspend_io_time[0][1]) {
+ if ((io_MB_per_second(0) < 5) || (io_MB_per_second(1) < 5)) {
+ SNPRINTF("- I/O speed: Write %d KB/s",
+ (KB((unsigned long) suspend_io_time[0][0]) * HZ /
+ suspend_io_time[0][1]));
+ if (suspend_io_time[1][1])
+ SNPRINTF(", Read %d KB/s",
+ (KB((unsigned long) suspend_io_time[1][0]) * HZ /
+ suspend_io_time[1][1]));
+ } else {
+ SNPRINTF("- I/O speed: Write %d MB/s",
+ (MB((unsigned long) suspend_io_time[0][0]) * HZ /
+ suspend_io_time[0][1]));
+ if (suspend_io_time[1][1])
+ SNPRINTF(", Read %d MB/s",
+ (MB((unsigned long) suspend_io_time[1][0]) * HZ /
+ suspend_io_time[1][1]));
+ }
+ SNPRINTF(".\n");
+ }
+ else
+ SNPRINTF("- No I/O speed stats available.\n");
+ SNPRINTF("- Extra pages : %d used/%d.\n",
+ extra_pd1_pages_used, extra_pd1_pages_allowance);
+
+ return len;
+}
+
+/*
+ * debuginfo_read_proc
+ * Functionality : Displays information that may be helpful in debugging
+ * software suspend.
+ */
+int debuginfo_read_proc(char *page, char **start, off_t off, int count,
+ int *eof, void *data)
+{
+ int info_len, copy_len;
+
+ info_len = get_suspend_debug_info();
+
+ copy_len = min(info_len - (int) off, count);
+ if (copy_len < 0)
+ copy_len = 0;
+
+ if (copy_len) {
+ memcpy(page, debug_info_buffer + off, copy_len);
+ *start = page;
+ }
+
+ if (copy_len + off == info_len)
+ *eof = 1;
+
+ free_page((unsigned long) debug_info_buffer);
+ debug_info_buffer = NULL;
+ return copy_len;
+}
+
--
Nigel Cunningham nigel at suspend2 dot net
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