/* * Copyright 2013, Michael Ellerman, IBM Corp. * Licensed under GPLv2. */ #define _GNU_SOURCE #include #include #include #include #include #include "event.h" int perf_event_open(struct perf_event_attr *attr, pid_t pid, int cpu, int group_fd, unsigned long flags) { return syscall(__NR_perf_event_open, attr, pid, cpu, group_fd, flags); } void event_init_opts(struct event *e, u64 config, int type, char *name) { memset(e, 0, sizeof(*e)); e->name = name; e->attr.type = type; e->attr.config = config; e->attr.size = sizeof(e->attr); /* This has to match the structure layout in the header */ e->attr.read_format = PERF_FORMAT_TOTAL_TIME_ENABLED | \ PERF_FORMAT_TOTAL_TIME_RUNNING; } void event_init_named(struct event *e, u64 config, char *name) { event_init_opts(e, config, PERF_TYPE_RAW, name); } void event_init(struct event *e, u64 config) { event_init_opts(e, config, PERF_TYPE_RAW, "event"); } #define PERF_CURRENT_PID 0 #define PERF_NO_PID -1 #define PERF_NO_CPU -1 #define PERF_NO_GROUP -1 int event_open_with_options(struct event *e, pid_t pid, int cpu, int group_fd) { e->fd = perf_event_open(&e->attr, pid, cpu, group_fd, 0); if (e->fd == -1) { perror("perf_event_open"); return -1; } return 0; } int event_open_with_group(struct event *e, int group_fd) { return event_open_with_options(e, PERF_CURRENT_PID, PERF_NO_CPU, group_fd); } int event_open_with_pid(struct event *e, pid_t pid) { return event_open_with_options(e, pid, PERF_NO_CPU, PERF_NO_GROUP); } int event_open_with_cpu(struct event *e, int cpu) { return event_open_with_options(e, PERF_NO_PID, cpu, PERF_NO_GROUP); } int event_open(struct event *e) { return event_open_with_options(e, PERF_CURRENT_PID, PERF_NO_CPU, PERF_NO_GROUP); } void event_close(struct event *e) { close(e->fd); } int event_enable(struct event *e) { return ioctl(e->fd, PERF_EVENT_IOC_ENABLE); } int event_disable(struct event *e) { return ioctl(e->fd, PERF_EVENT_IOC_DISABLE); } int event_reset(struct event *e) { return ioctl(e->fd, PERF_EVENT_IOC_RESET); } int event_read(struct event *e) { int rc; rc = read(e->fd, &e->result, sizeof(e->result)); if (rc != sizeof(e->result)) { fprintf(stderr, "read error on event %p!\n", e); return -1; } return 0; } void event_report_justified(struct event *e, int name_width, int result_width) { printf("%*s: result %*llu ", name_width, e->name, result_width, e->result.value); if (e->result.running == e->result.enabled) printf("running/enabled %llu\n", e->result.running); else printf("running %llu enabled %llu\n", e->result.running, e->result.enabled); } void event_report(struct event *e) { event_report_justified(e, 0, 0); } >
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authorLinus Torvalds <torvalds@linux-foundation.org>2017-01-01 12:27:05 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-01-01 12:27:05 -0800
commit4759d386d55fef452d692bf101167914437e848e (patch)
treee7109c192ec589fcea2a98f9702aa3c0e4009581 /tools/cgroup
parent238d1d0f79f619d75c2cc741d6770fb0986aef24 (diff)
parent1db175428ee374489448361213e9c3b749d14900 (diff)
Merge branch 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm
Pull DAX updates from Dan Williams: "The completion of Jan's DAX work for 4.10. As I mentioned in the libnvdimm-for-4.10 pull request, these are some final fixes for the DAX dirty-cacheline-tracking invalidation work that was merged through the -mm, ext4, and xfs trees in -rc1. These patches were prepared prior to the merge window, but we waited for 4.10-rc1 to have a stable merge base after all the prerequisites were merged. Quoting Jan on the overall changes in these patches: "So I'd like all these 6 patches to go for rc2. The first three patches fix invalidation of exceptional DAX entries (a bug which is there for a long time) - without these patches data loss can occur on power failure even though user called fsync(2). The other three patches change locking of DAX faults so that ->iomap_begin() is called in a more relaxed locking context and we are safe to start a transaction there for ext4" These have received a build success notification from the kbuild robot, and pass the latest libnvdimm unit tests. There have not been any -next releases since -rc1, so they have not appeared there" * 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm: ext4: Simplify DAX fault path dax: Call ->iomap_begin without entry lock during dax fault dax: Finish fault completely when loading holes dax: Avoid page invalidation races and unnecessary radix tree traversals mm: Invalidate DAX radix tree entries only if appropriate ext2: Return BH_New buffers for zeroed blocks
Diffstat (limited to 'tools/cgroup')