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| author |   Eric W. Biederman <ebiederm@xmission.com> | 2017-09-26 13:06:43 -0500 |
|---|---|---|
| committer | Eric W. Biederman <ebiederm@xmission.com> | 2018-07-21 10:43:12 -0500 |
| commit | 2c4704756cab7cfa031ada4dab361562f0e357c0 (patch) | |
| tree | 8757eb8762d60e34eeab747493759abf3f902c09 /include/linux/pid.h | |
| parent | kvm: Don't open code task_pid in kvm_vcpu_ioctl (diff) | |
| download | wireguard-linux-2c4704756cab7cfa031ada4dab361562f0e357c0.tar.xz wireguard-linux-2c4704756cab7cfa031ada4dab361562f0e357c0.zip | |
pids: Move the pgrp and session pid pointers from task_struct to signal_struct
To access these fields the code always has to go to group leader so
going to signal struct is no loss and is actually a fundamental simplification.
This saves a little bit of memory by only allocating the pid pointer array
once instead of once for every thread, and even better this removes a
few potential races caused by the fact that group_leader can be changed
by de_thread, while signal_struct can not.
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'include/linux/pid.h')
| -rw-r--r-- | include/linux/pid.h | 8 |
1 files changed, 1 insertions, 7 deletions
diff --git a/include/linux/pid.h b/include/linux/pid.h index 7633d55d9a24..3d4c504dcc8c 100644 --- a/include/linux/pid.h +++ b/include/linux/pid.h @@ -67,12 +67,6 @@ struct pid extern struct pid init_struct_pid; -struct pid_link -{ - struct hlist_node node; - struct pid *pid; -}; - static inline struct pid *get_pid(struct pid *pid) { if (pid) @@ -177,7 +171,7 @@ pid_t pid_vnr(struct pid *pid); do { \ if ((pid) != NULL) \ hlist_for_each_entry_rcu((task), \ - &(pid)->tasks[type], pids[type].node) { + &(pid)->tasks[type], pid_links[type]) { /* * Both old and new leaders may be attached to |