diff options
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/accounting/getdelays.c | 38 | ||||
| -rw-r--r-- | Documentation/cgroups/cgroups.txt | 14 | ||||
| -rw-r--r-- | Documentation/feature-removal-schedule.txt | 17 | ||||
| -rw-r--r-- | Documentation/filesystems/proc.txt | 17 | ||||
| -rw-r--r-- | Documentation/sysctl/vm.txt | 12 |
5 files changed, 87 insertions, 11 deletions
diff --git a/Documentation/accounting/getdelays.c b/Documentation/accounting/getdelays.c index 6e25c2659e0a..a2976a6de033 100644 --- a/Documentation/accounting/getdelays.c +++ b/Documentation/accounting/getdelays.c @@ -21,6 +21,7 @@ #include <sys/types.h> #include <sys/stat.h> #include <sys/socket.h> +#include <sys/wait.h> #include <signal.h> #include <linux/genetlink.h> @@ -266,11 +267,13 @@ int main(int argc, char *argv[]) int containerset = 0; char containerpath[1024]; int cfd = 0; + int forking = 0; + sigset_t sigset; struct msgtemplate msg; - while (1) { - c = getopt(argc, argv, "qdiw:r:m:t:p:vlC:"); + while (!forking) { + c = getopt(argc, argv, "qdiw:r:m:t:p:vlC:c:"); if (c < 0) break; @@ -319,6 +322,28 @@ int main(int argc, char *argv[]) err(1, "Invalid pid\n"); cmd_type = TASKSTATS_CMD_ATTR_PID; break; + case 'c': + + /* Block SIGCHLD for sigwait() later */ + if (sigemptyset(&sigset) == -1) + err(1, "Failed to empty sigset"); + if (sigaddset(&sigset, SIGCHLD)) + err(1, "Failed to set sigchld in sigset"); + sigprocmask(SIG_BLOCK, &sigset, NULL); + + /* fork/exec a child */ + tid = fork(); + if (tid < 0) + err(1, "Fork failed\n"); + if (tid == 0) + if (execvp(argv[optind - 1], + &argv[optind - 1]) < 0) + exit(-1); + + /* Set the command type and avoid further processing */ + cmd_type = TASKSTATS_CMD_ATTR_PID; + forking = 1; + break; case 'v': printf("debug on\n"); dbg = 1; @@ -370,6 +395,15 @@ int main(int argc, char *argv[]) goto err; } + /* + * If we forked a child, wait for it to exit. Cannot use waitpid() + * as all the delicious data would be reaped as part of the wait + */ + if (tid && forking) { + int sig_received; + sigwait(&sigset, &sig_received); + } + if (tid) { rc = send_cmd(nl_sd, id, mypid, TASKSTATS_CMD_GET, cmd_type, &tid, sizeof(__u32)); diff --git a/Documentation/cgroups/cgroups.txt b/Documentation/cgroups/cgroups.txt index b34823ff1646..190018b0c649 100644 --- a/Documentation/cgroups/cgroups.txt +++ b/Documentation/cgroups/cgroups.txt @@ -18,7 +18,8 @@ CONTENTS: 1.2 Why are cgroups needed ? 1.3 How are cgroups implemented ? 1.4 What does notify_on_release do ? - 1.5 How do I use cgroups ? + 1.5 What does clone_children do ? + 1.6 How do I use cgroups ? 2. Usage Examples and Syntax 2.1 Basic Usage 2.2 Attaching processes @@ -293,7 +294,16 @@ notify_on_release in the root cgroup at system boot is disabled value of their parents notify_on_release setting. The default value of a cgroup hierarchy's release_agent path is empty. -1.5 How do I use cgroups ? +1.5 What does clone_children do ? +--------------------------------- + +If the clone_children flag is enabled (1) in a cgroup, then all +cgroups created beneath will call the post_clone callbacks for each +subsystem of the newly created cgroup. Usually when this callback is +implemented for a subsystem, it copies the values of the parent +subsystem, this is the case for the cpuset. + +1.6 How do I use cgroups ? -------------------------- To start a new job that is to be contained within a cgroup, using diff --git a/Documentation/feature-removal-schedule.txt b/Documentation/feature-removal-schedule.txt index d2af87ba96e1..f3da8c0a3af2 100644 --- a/Documentation/feature-removal-schedule.txt +++ b/Documentation/feature-removal-schedule.txt @@ -526,6 +526,23 @@ Who: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> ---------------------------- +What: namespace cgroup (ns_cgroup) +When: 2.6.38 +Why: The ns_cgroup leads to some problems: + * cgroup creation is out-of-control + * cgroup name can conflict when pids are looping + * it is not possible to have a single process handling + a lot of namespaces without falling in a exponential creation time + * we may want to create a namespace without creating a cgroup + + The ns_cgroup is replaced by a compatibility flag 'clone_children', + where a newly created cgroup will copy the parent cgroup values. + The userspace has to manually create a cgroup and add a task to + the 'tasks' file. +Who: Daniel Lezcano <daniel.lezcano@free.fr> + +---------------------------- + What: iwlwifi disable_hw_scan module parameters When: 2.6.40 Why: Hareware scan is the prefer method for iwlwifi devices for diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt index a563b74c7aef..e73df2722ff3 100644 --- a/Documentation/filesystems/proc.txt +++ b/Documentation/filesystems/proc.txt @@ -136,6 +136,7 @@ Table 1-1: Process specific entries in /proc statm Process memory status information status Process status in human readable form wchan If CONFIG_KALLSYMS is set, a pre-decoded wchan + pagemap Page table stack Report full stack trace, enable via CONFIG_STACKTRACE smaps a extension based on maps, showing the memory consumption of each mapping @@ -370,6 +371,7 @@ Shared_Dirty: 0 kB Private_Clean: 0 kB Private_Dirty: 0 kB Referenced: 892 kB +Anonymous: 0 kB Swap: 0 kB KernelPageSize: 4 kB MMUPageSize: 4 kB @@ -378,9 +380,15 @@ The first of these lines shows the same information as is displayed for the mapping in /proc/PID/maps. The remaining lines show the size of the mapping (size), the amount of the mapping that is currently resident in RAM (RSS), the process' proportional share of this mapping (PSS), the number of clean and -dirty shared pages in the mapping, and the number of clean and dirty private -pages in the mapping. The "Referenced" indicates the amount of memory -currently marked as referenced or accessed. +dirty private pages in the mapping. Note that even a page which is part of a +MAP_SHARED mapping, but has only a single pte mapped, i.e. is currently used +by only one process, is accounted as private and not as shared. "Referenced" +indicates the amount of memory currently marked as referenced or accessed. +"Anonymous" shows the amount of memory that does not belong to any file. Even +a mapping associated with a file may contain anonymous pages: when MAP_PRIVATE +and a page is modified, the file page is replaced by a private anonymous copy. +"Swap" shows how much would-be-anonymous memory is also used, but out on +swap. This file is only present if the CONFIG_MMU kernel configuration option is enabled. @@ -397,6 +405,9 @@ To clear the bits for the file mapped pages associated with the process > echo 3 > /proc/PID/clear_refs Any other value written to /proc/PID/clear_refs will have no effect. +The /proc/pid/pagemap gives the PFN, which can be used to find the pageflags +using /proc/kpageflags and number of times a page is mapped using +/proc/kpagecount. For detailed explanation, see Documentation/vm/pagemap.txt. 1.2 Kernel data --------------- diff --git a/Documentation/sysctl/vm.txt b/Documentation/sysctl/vm.txt index b606c2c4dd37..30289fab86eb 100644 --- a/Documentation/sysctl/vm.txt +++ b/Documentation/sysctl/vm.txt @@ -80,8 +80,10 @@ dirty_background_bytes Contains the amount of dirty memory at which the pdflush background writeback daemon will start writeback. -If dirty_background_bytes is written, dirty_background_ratio becomes a function -of its value (dirty_background_bytes / the amount of dirtyable system memory). +Note: dirty_background_bytes is the counterpart of dirty_background_ratio. Only +one of them may be specified at a time. When one sysctl is written it is +immediately taken into account to evaluate the dirty memory limits and the +other appears as 0 when read. ============================================================== @@ -97,8 +99,10 @@ dirty_bytes Contains the amount of dirty memory at which a process generating disk writes will itself start writeback. -If dirty_bytes is written, dirty_ratio becomes a function of its value -(dirty_bytes / the amount of dirtyable system memory). +Note: dirty_bytes is the counterpart of dirty_ratio. Only one of them may be +specified at a time. When one sysctl is written it is immediately taken into +account to evaluate the dirty memory limits and the other appears as 0 when +read. Note: the minimum value allowed for dirty_bytes is two pages (in bytes); any value lower than this limit will be ignored and the old configuration will be |