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Revision 0af83abbd4a6e36a4b209d8c57c26143e40eeec1 authored by Liu Song on 06 August 2019, 14:21:40 UTC, committed by Richard Weinberger on 22 August 2019, 15:25:33 UTC 
ubifs: Limit the number of pages in shrink_liability
 
If the number of dirty pages to be written back is large,
then writeback_inodes_sb will block waiting for a long time,
causing hung task detection alarm. Therefore, we should limit
the maximum number of pages written back this time, which let
the budget be completed faster. The remaining dirty pages
tend to rely on the writeback mechanism to complete the
synchronization.

Fixes: b6e51316daed ("writeback: separate starting of sync vs opportunistic writeback")
Signed-off-by: Liu Song <liu.song11@zte.com.cn>
Signed-off-by: Richard Weinberger <richard@nod.at>
1 parent 377e208
Raw File
configs.c 
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * kernel/configs.c
 * Echo the kernel .config file used to build the kernel
 *
 * Copyright (C) 2002 Khalid Aziz <khalid_aziz@hp.com>
 * Copyright (C) 2002 Randy Dunlap <rdunlap@xenotime.net>
 * Copyright (C) 2002 Al Stone <ahs3@fc.hp.com>
 * Copyright (C) 2002 Hewlett-Packard Company
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/init.h>
#include <linux/uaccess.h>

/*
 * "IKCFG_ST" and "IKCFG_ED" are used to extract the config data from
 * a binary kernel image or a module. See scripts/extract-ikconfig.
 */
asm (
"	.pushsection .rodata, \"a\"		\n"
"	.ascii \"IKCFG_ST\"			\n"
"	.global kernel_config_data		\n"
"kernel_config_data:				\n"
"	.incbin \"kernel/config_data.gz\"	\n"
"	.global kernel_config_data_end		\n"
"kernel_config_data_end:			\n"
"	.ascii \"IKCFG_ED\"			\n"
"	.popsection				\n"
);

#ifdef CONFIG_IKCONFIG_PROC

extern char kernel_config_data;
extern char kernel_config_data_end;

static ssize_t
ikconfig_read_current(struct file *file, char __user *buf,
		      size_t len, loff_t * offset)
{
	return simple_read_from_buffer(buf, len, offset,
				       &kernel_config_data,
				       &kernel_config_data_end -
				       &kernel_config_data);
}

static const struct file_operations ikconfig_file_ops = {
	.owner = THIS_MODULE,
	.read = ikconfig_read_current,
	.llseek = default_llseek,
};

static int __init ikconfig_init(void)
{
	struct proc_dir_entry *entry;

	/* create the current config file */
	entry = proc_create("config.gz", S_IFREG | S_IRUGO, NULL,
			    &ikconfig_file_ops);
	if (!entry)
		return -ENOMEM;

	proc_set_size(entry, &kernel_config_data_end - &kernel_config_data);

	return 0;
}

static void __exit ikconfig_cleanup(void)
{
	remove_proc_entry("config.gz", NULL);
}

module_init(ikconfig_init);
module_exit(ikconfig_cleanup);

#endif /* CONFIG_IKCONFIG_PROC */

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Randy Dunlap");
MODULE_DESCRIPTION("Echo the kernel .config file used to build the kernel");
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