24b59982a7
This is a backport from Linux 5.2-rc1 of a patch series to greatly enhance vmalloc's performance especially on embedded systems, plus all of its dependencies that were missing in kernel 4.9. For all the informations, refer to LKML: https://lkml.org/lkml/2018/10/19/786 Brief informations: Currently an allocation of the new VA area is done over busy list iteration until a suitable hole is found between two busy areas. Therefore each new allocation causes the list being grown. Due to long list and different permissive parameters an allocation can take a long time on embedded devices(milliseconds). This patch organizes the vmalloc memory layout into free areas of the VMALLOC_START-VMALLOC_END range. It uses a red-black tree that keeps blocks sorted by their offsets in pair with linked list keeping the free space in order of increasing addresses. Quote Phoronix: With this patch from Uladzislau Rezki, calling vmalloc() can take up to 67% less time compared to the behavior on Linux 5.1 and prior, at least with tests done by the developer under QEMU. Personal tests are showing that the device is more responsive when memory pressure is high and when huge allocations are to be done, it's also noticeably faster in this case, like when starting Chrome with more than 100 opened tabs after a system reboot (so, an uncached complete load of it). Shameless kanged from: https://github.com/sonyxperiadev/kernel / Pull Request 2016 Signed-off-by: sweetyicecare <gabrielseedev@outlook.com> Signed-off-by: Aoihara <veronicadisa6@gmail.com> Signed-off-by: KangMamles <imzea69@gmail.com> Signed-off-by: Sorayukii <sorayukii69@gmail.com>
78 lines
1.9 KiB
C
78 lines
1.9 KiB
C
/*
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* AppArmor security module
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*
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* This file contains basic common functions used in AppArmor
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*
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* Copyright (C) 1998-2008 Novell/SUSE
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* Copyright 2009-2010 Canonical Ltd.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, version 2 of the
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* License.
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*/
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/vmalloc.h>
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#include "include/audit.h"
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#include "include/apparmor.h"
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/**
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* aa_split_fqname - split a fqname into a profile and namespace name
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* @fqname: a full qualified name in namespace profile format (NOT NULL)
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* @ns_name: pointer to portion of the string containing the ns name (NOT NULL)
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*
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* Returns: profile name or NULL if one is not specified
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*
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* Split a namespace name from a profile name (see policy.c for naming
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* description). If a portion of the name is missing it returns NULL for
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* that portion.
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*
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* NOTE: may modify the @fqname string. The pointers returned point
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* into the @fqname string.
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*/
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char *aa_split_fqname(char *fqname, char **ns_name)
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{
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char *name = strim(fqname);
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*ns_name = NULL;
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if (name[0] == ':') {
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char *split = strchr(&name[1], ':');
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*ns_name = skip_spaces(&name[1]);
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if (split) {
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/* overwrite ':' with \0 */
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*split++ = 0;
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if (strncmp(split, "//", 2) == 0)
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split += 2;
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name = skip_spaces(split);
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} else
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/* a ns name without a following profile is allowed */
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name = NULL;
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}
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if (name && *name == 0)
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name = NULL;
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return name;
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}
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/**
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* aa_info_message - log a none profile related status message
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* @str: message to log
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*/
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void aa_info_message(const char *str)
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{
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if (audit_enabled) {
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struct common_audit_data sa;
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struct apparmor_audit_data aad = {0,};
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sa.type = LSM_AUDIT_DATA_NONE;
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sa.aad = &aad;
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aad.info = str;
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aa_audit_msg(AUDIT_APPARMOR_STATUS, &sa, NULL);
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}
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printk(KERN_INFO "AppArmor: %s\n", str);
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}
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