77 lines
1.7 KiB
C
77 lines
1.7 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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#include <linux/types.h>
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#include <linux/string.h>
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#include "../../util/machine.h"
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#include "../../util/tool.h"
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#include "../../util/map.h"
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#include "../../util/util.h"
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#include "../../util/debug.h"
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#if defined(__x86_64__)
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int perf_event__synthesize_extra_kmaps(struct perf_tool *tool,
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perf_event__handler_t process,
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struct machine *machine)
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{
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int rc = 0;
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struct map *pos;
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struct map_groups *kmaps = &machine->kmaps;
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struct maps *maps = &kmaps->maps;
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union perf_event *event = zalloc(sizeof(event->mmap) +
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machine->id_hdr_size);
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if (!event) {
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pr_debug("Not enough memory synthesizing mmap event "
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"for extra kernel maps\n");
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return -1;
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}
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for (pos = maps__first(maps); pos; pos = map__next(pos)) {
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struct kmap *kmap;
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size_t size;
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if (!__map__is_extra_kernel_map(pos))
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continue;
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kmap = map__kmap(pos);
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size = sizeof(event->mmap) - sizeof(event->mmap.filename) +
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PERF_ALIGN(strlen(kmap->name) + 1, sizeof(u64)) +
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machine->id_hdr_size;
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memset(event, 0, size);
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event->mmap.header.type = PERF_RECORD_MMAP;
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/*
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* kernel uses 0 for user space maps, see kernel/perf_event.c
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* __perf_event_mmap
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*/
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if (machine__is_host(machine))
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event->header.misc = PERF_RECORD_MISC_KERNEL;
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else
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event->header.misc = PERF_RECORD_MISC_GUEST_KERNEL;
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event->mmap.header.size = size;
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event->mmap.start = pos->start;
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event->mmap.len = pos->end - pos->start;
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event->mmap.pgoff = pos->pgoff;
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event->mmap.pid = machine->pid;
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strlcpy(event->mmap.filename, kmap->name, PATH_MAX);
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if (perf_tool__process_synth_event(tool, event, machine,
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process) != 0) {
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rc = -1;
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break;
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}
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}
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free(event);
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return rc;
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}
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#endif
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