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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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591765fdaf
For long running sessions with many threads with short lifetimes the amount of memory that the buildid process takes is too much. Since we don't have hist_entries that may be pointing to them, we can just release the resources associated with each thread when the exit (PERF_RECORD_EXIT) event is received. For normal processing we need to annotate maps with hits, and thus hist_entries pointing to it and drop the ones that had none. Will be done in a followup patch. Cc: David S. Miller <davem@davemloft.net> 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>
78 lines
1.9 KiB
C
78 lines
1.9 KiB
C
/*
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* build-id.c
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*
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* build-id support
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*
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* Copyright (C) 2009, 2010 Red Hat Inc.
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* Copyright (C) 2009, 2010 Arnaldo Carvalho de Melo <acme@redhat.com>
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*/
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#include "util.h"
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#include <stdio.h>
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#include "build-id.h"
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#include "event.h"
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#include "symbol.h"
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#include <linux/kernel.h>
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#include "debug.h"
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static int build_id__mark_dso_hit(event_t *event, struct perf_session *session)
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{
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struct addr_location al;
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u8 cpumode = event->header.misc & PERF_RECORD_MISC_CPUMODE_MASK;
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struct thread *thread = perf_session__findnew(session, event->ip.pid);
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if (thread == NULL) {
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pr_err("problem processing %d event, skipping it.\n",
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event->header.type);
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return -1;
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}
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thread__find_addr_map(thread, session, cpumode, MAP__FUNCTION,
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event->ip.pid, event->ip.ip, &al);
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if (al.map != NULL)
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al.map->dso->hit = 1;
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return 0;
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}
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static int event__exit_del_thread(event_t *self, struct perf_session *session)
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{
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struct thread *thread = perf_session__findnew(session, self->fork.tid);
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dump_printf("(%d:%d):(%d:%d)\n", self->fork.pid, self->fork.tid,
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self->fork.ppid, self->fork.ptid);
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if (thread) {
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rb_erase(&thread->rb_node, &session->threads);
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session->last_match = NULL;
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thread__delete(thread);
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}
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return 0;
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}
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struct perf_event_ops build_id__mark_dso_hit_ops = {
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.sample = build_id__mark_dso_hit,
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.mmap = event__process_mmap,
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.fork = event__process_task,
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.exit = event__exit_del_thread,
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};
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char *dso__build_id_filename(struct dso *self, char *bf, size_t size)
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{
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char build_id_hex[BUILD_ID_SIZE * 2 + 1];
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if (!self->has_build_id)
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return NULL;
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build_id__sprintf(self->build_id, sizeof(self->build_id), build_id_hex);
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if (bf == NULL) {
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if (asprintf(&bf, "%s/.build-id/%.2s/%s", buildid_dir,
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build_id_hex, build_id_hex + 2) < 0)
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return NULL;
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} else
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snprintf(bf, size, "%s/.build-id/%.2s/%s", buildid_dir,
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build_id_hex, build_id_hex + 2);
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return bf;
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}
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