forked from Minki/linux
70db7533ca
Adopting the new model used in 'perf record', where we don't have a map per thread per cpu, instead we have an mmap per cpu, established on the first fd for that cpu and ask the kernel using the PERF_EVENT_IOC_SET_OUTPUT ioctl to send events for the other fds on that cpu for the one with the mmap. The methods moved from perf_evsel to perf_evlist, but for easing review they were modified in place, in evsel.c, the next patch will move the migrated methods to evlist.c. With this 'perf top' now uses the same mmap model used by 'perf record' and the next patches will make 'perf record' use these new routines, establishing a common codebase for both tools. Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Tom Zanussi <tzanussi@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
98 lines
2.1 KiB
C
98 lines
2.1 KiB
C
#include <poll.h>
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#include "evlist.h"
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#include "evsel.h"
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#include "util.h"
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#include <linux/bitops.h>
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#include <linux/hash.h>
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struct perf_evlist *perf_evlist__new(void)
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{
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struct perf_evlist *evlist = zalloc(sizeof(*evlist));
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if (evlist != NULL) {
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int i;
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for (i = 0; i < PERF_EVLIST__HLIST_SIZE; ++i)
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INIT_HLIST_HEAD(&evlist->heads[i]);
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INIT_LIST_HEAD(&evlist->entries);
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}
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return evlist;
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}
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static void perf_evlist__purge(struct perf_evlist *evlist)
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{
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struct perf_evsel *pos, *n;
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list_for_each_entry_safe(pos, n, &evlist->entries, node) {
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list_del_init(&pos->node);
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perf_evsel__delete(pos);
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}
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evlist->nr_entries = 0;
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}
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void perf_evlist__delete(struct perf_evlist *evlist)
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{
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perf_evlist__purge(evlist);
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free(evlist->mmap);
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free(evlist->pollfd);
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free(evlist);
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}
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void perf_evlist__add(struct perf_evlist *evlist, struct perf_evsel *entry)
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{
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list_add_tail(&entry->node, &evlist->entries);
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++evlist->nr_entries;
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}
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int perf_evlist__add_default(struct perf_evlist *evlist)
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{
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struct perf_event_attr attr = {
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.type = PERF_TYPE_HARDWARE,
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.config = PERF_COUNT_HW_CPU_CYCLES,
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};
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struct perf_evsel *evsel = perf_evsel__new(&attr, 0);
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if (evsel == NULL)
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return -ENOMEM;
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perf_evlist__add(evlist, evsel);
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return 0;
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}
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int perf_evlist__alloc_pollfd(struct perf_evlist *evlist, int ncpus, int nthreads)
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{
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int nfds = ncpus * nthreads * evlist->nr_entries;
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evlist->pollfd = malloc(sizeof(struct pollfd) * nfds);
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return evlist->pollfd != NULL ? 0 : -ENOMEM;
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}
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void perf_evlist__add_pollfd(struct perf_evlist *evlist, int fd)
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{
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fcntl(fd, F_SETFL, O_NONBLOCK);
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evlist->pollfd[evlist->nr_fds].fd = fd;
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evlist->pollfd[evlist->nr_fds].events = POLLIN;
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evlist->nr_fds++;
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}
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struct perf_evsel *perf_evlist__id2evsel(struct perf_evlist *evlist, u64 id)
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{
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struct hlist_head *head;
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struct hlist_node *pos;
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struct perf_sample_id *sid;
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int hash;
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if (evlist->nr_entries == 1)
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return list_entry(evlist->entries.next, struct perf_evsel, node);
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hash = hash_64(id, PERF_EVLIST__HLIST_BITS);
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head = &evlist->heads[hash];
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hlist_for_each_entry(sid, pos, head, node)
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if (sid->id == id)
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return sid->evsel;
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return NULL;
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}
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