The patch titled
cgroups: add the trigger callback to struct cftype
has been added to the -mm tree. Its filename is
cgroups-add-the-trigger-callback-to-struct-cftype.patch
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------------------------------------------------------
Subject: cgroups: add the trigger callback to struct cftype
From: Pavel Emelyanov <xemul@xxxxxxxxxx>
Trigger callback can be used to receive a kick-up from the user space. The
string written is ignored.
The cftype->private is used for multiplexing events.
Signed-off-by: Pavel Emelyanov <xemul@xxxxxxxxxx>
Acked-by: Paul Menage <menage@xxxxxxxxxx>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Cc: Balbir Singh <balbir@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/cgroup.h | 8 ++++++++
kernel/cgroup.c | 4 ++++
2 files changed, 12 insertions(+)
diff -puN include/linux/cgroup.h~cgroups-add-the-trigger-callback-to-struct-cftype include/linux/cgroup.h
--- a/include/linux/cgroup.h~cgroups-add-the-trigger-callback-to-struct-cftype
+++ a/include/linux/cgroup.h
@@ -243,6 +243,14 @@ struct cftype {
*/
int (*write_s64) (struct cgroup *cgrp, struct cftype *cft, s64 val);
+ /*
+ * trigger() callback can be used to get some kick from the
+ * userspace, when the actual string written is not important
+ * at all. The private field can be used to determine the
+ * kick type for multiplexing.
+ */
+ int (*trigger)(struct cgroup *cgrp, unsigned int event);
+
int (*release) (struct inode *inode, struct file *file);
};
diff -puN kernel/cgroup.c~cgroups-add-the-trigger-callback-to-struct-cftype kernel/cgroup.c
--- a/kernel/cgroup.c~cgroups-add-the-trigger-callback-to-struct-cftype
+++ a/kernel/cgroup.c
@@ -1410,6 +1410,10 @@ static ssize_t cgroup_file_write(struct
return cft->write(cgrp, cft, file, buf, nbytes, ppos);
if (cft->write_u64 || cft->write_s64)
return cgroup_write_X64(cgrp, cft, file, buf, nbytes, ppos);
+ if (cft->trigger) {
+ int ret = cft->trigger(cgrp, (unsigned int)cft->private);
+ return ret ? ret : nbytes;
+ }
return -EINVAL;
}
_
Patches currently in -mm which might be from xemul@xxxxxxxxxx are
origin.patch
git-kgdb-light.patch
use-find_task_by_vpid-in-audit-code.patch
ia64-fix-getpid-and-set_tid_address-fast-system-calls-for-pid-namespaces.patch
git-udf.patch
mm-have-zonelist-contains-structs-with-both-a-zone-pointer-and-zone_idx-fix-memcg-ooms.patch
mm-have-zonelist-contains-structs-with-both-a-zone-pointer-and-zone_idx-just-return-do_try_to_free_pages.patch
mm-have-zonelist-contains-structs-with-both-a-zone-pointer-and-zone_idx-just-return-do_try_to_free_pages-do_try_to_free_pages-gfp_mask-redundant.patch
binfmt_miscc-avoid-potential-kernel-stack-overflow.patch
cgroup-api-files-rename-read-write_uint-methods-to-read_write_u64.patch
cgroup-api-files-add-res_counter_read_u64.patch
cgroup-api-files-use-read_u64-in-memory-controller.patch
cgroup-api-files-strip-all-trailing-whitespace-in-cgroup_write_u64.patch
cgroup-api-files-update-cpusets-to-use-cgroup-structured-file-api.patch
cgroup-api-files-update-cpusets-to-use-cgroup-structured-file-api-fix.patch
cgroup-api-files-add-cgroup-map-data-type.patch
cgroup-api-files-use-cgroup-map-for-memcontrol-stats-file.patch
cgroup-api-files-drop-mem_cgroup_force_empty.patch
cgroup-api-files-move-releasable-to-cgroup_debug-subsystem.patch
cgroup-api-files-make-cgroup_debug-default-to-off.patch
cgroups-add-cgroup-support-for-enabling-controllers-at-boot-time.patch
cgroups-add-the-trigger-callback-to-struct-cftype.patch
memory-controller-make-memory-resource-control-aware-of-boot-options.patch
memcgroup-add-the-max_usage-member-on-the-res_counter.patch
add-a-document-describing-the-resource-counter-abstraction-v2.patch
add-a-document-describing-the-resource-counter-abstraction-v2-fix.patch
memcgroup-move-memory-controller-allocations-to-their-own-slabs.patch
remove-unused-variable-from-send_signal.patch
turn-legacy_queue-macro-into-static-inline-function.patch
consolidate-checking-for-ignored-legacy-signals.patch
consolidate-checking-for-ignored-legacy-signals-simplify.patch
signals-consolidate-checks-for-whether-or-not-to-ignore-a-signal.patch
signals-clean-dequeue_signal-from-excess-checks-and-assignments.patch
signals-consolidate-send_sigqueue-and-send_group_sigqueue.patch
signals-cleanup-security_task_kill-usage-implementation.patch
signals-use-__group_complete_signal-for-the-specific-signals-too.patch
signals-fold-complete_signal-into-send_signal-do_send_sigqueue.patch
signals-unify-send_sigqueue-send_group_sigqueue-completely.patch
sysctl-merge-equal-proc_sys_read-and-proc_sys_write.patch
sysctl-clean-from-unneeded-extern-and-forward-declarations.patch
sysctl-add-the-permissions-callback-on-the-ctl_table_root.patch
free_pidmap-turn-it-into-free_pidmapstruct-upid.patch
use-find_task_by_vpid-in-taskstats.patch
deprecate-find_task_by_pid.patch
deprecate-find_task_by_pid-warning-fix.patch
pidns-make-pid-level-and-pid_ns-level-unsigned.patch
reiser4.patch
put_pid-make-sure-we-dont-free-the-live-pid.patch
memcgroup-use-triggers-in-force_empty-and-max_usage-files.patch
memcgroup-implement-failcounter-reset.patch
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