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ANDROID: user: Add vendor hook to user for GKI purpose

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In order to implement our scheduling tuning policy in certain cases, we
need to initialize the variables that we have defined in the
user_struct. To achieve this, we will add a vendor hook to user.c at
alloc_uid, which will ensure that our own logic is executed during the
initialization of the user_struct.

Bug: 187458531

Signed-off-by: heshuai1 <heshuai1@xiaomi.com>
Change-Id: I078484aac2c3d396aba5971d6d0f491652f3781c
(cherry picked from commit c9b8fa644f)
(cherry picked from commit 9ac0923ef565e4de4e1f35edcba6fcb7e45948c9)
This commit is contained in:
heshuai1
2021-05-19 18:45:44 +08:00
committed by Carlos Llamas
parent e273916482
commit 4b87d7254b
3 changed files with 30 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/android/vendor_hooks.c
View File

@@ -58,6 +58,7 @@
#include <trace/hooks/thermal.h>
#include <trace/hooks/audio_usboffload.h>
#include <trace/hooks/typec.h>
#include <trace/hooks/user.h>
/*
* Export tracepoints that act as a bare tracehook (ie: have no trace event
@@ -214,3 +215,6 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_binder_thread_release);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_binder_has_work_ilocked);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_binder_read_done);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_binder_preset);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_alloc_uid);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_free_user);

22
include/trace/hooks/user.h Normal file
View File

@@ -0,0 +1,22 @@
/* SPDX-License-Identifier: GPL-2.0 */
#undef TRACE_SYSTEM
#define TRACE_SYSTEM user
#undef TRACE_INCLUDE_PATH
#define TRACE_INCLUDE_PATH trace/hooks
#if !defined(_TRACE_HOOK_USER_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_HOOK_USER_H
#include <trace/hooks/vendor_hooks.h>
struct user_struct;
DECLARE_HOOK(android_vh_alloc_uid,
TP_PROTO(struct user_struct *user),
TP_ARGS(user));
DECLARE_HOOK(android_vh_free_user,
TP_PROTO(struct user_struct *up),
TP_ARGS(up));
#endif /* _TRACE_HOOK_USER_H */
/* This part must be outside protection */
#include <trace/define_trace.h>

4
kernel/user.c
View File

@@ -20,6 +20,8 @@
#include <linux/user_namespace.h>
#include <linux/proc_ns.h>
#include <trace/hooks/user.h>
/*
* userns count is 1 for root user, 1 for init_uts_ns,
* and 1 for... ?
@@ -152,6 +154,7 @@ static void user_epoll_free(struct user_struct *up)
static void free_user(struct user_struct *up, unsigned long flags)
__releases(&uidhash_lock)
{
trace_android_vh_free_user(up);
uid_hash_remove(up);
spin_unlock_irqrestore(&uidhash_lock, flags);
user_epoll_free(up);
@@ -202,6 +205,7 @@ struct user_struct *alloc_uid(kuid_t uid)
new->uid = uid;
refcount_set(&new->__count, 1);
trace_android_vh_alloc_uid(new);
if (user_epoll_alloc(new)) {
kmem_cache_free(uid_cachep, new);
return NULL;