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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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#include "event.h"#include "debug.h"#include "dso.h"#include "evlist.h"#include "namespaces.h"#include "symbol.h"#include <elf.h>
#include "tsc.h"#include "session.h"#include "jit.h"#include "jitdump.h"#include "genelf.h"#include "thread.h"
#include <linux/ctype.h>#include <linux/zalloc.h>
struct jit_buf_desc { struct perf_data *output; struct perf_session *session; struct machine *machine; struct nsinfo *nsi; union jr_entry *entry; void *buf; uint64_t sample_type; size_t bufsize; FILE *in; bool needs_bswap; /* handles cross-endianness */ bool use_arch_timestamp; void *debug_data; void *unwinding_data; uint64_t unwinding_size; uint64_t unwinding_mapped_size; uint64_t eh_frame_hdr_size; size_t nr_debug_entries; uint32_t code_load_count; u64 bytes_written; struct rb_root code_root; char dir[PATH_MAX];};
struct jit_tool { struct perf_tool tool; struct perf_data output; struct perf_data input; u64 bytes_written;};
#define hmax(a, b) ((a) > (b) ? (a) : (b))#define get_jit_tool(t) (container_of(tool, struct jit_tool, tool))
static intjit_emit_elf(struct jit_buf_desc *jd, char *filename, const char *sym, uint64_t code_addr, const void *code, int csize, void *debug, int nr_debug_entries, void *unwinding, uint32_t unwinding_header_size, uint32_t unwinding_size){ int ret, fd, saved_errno; struct nscookie nsc;
if (verbose > 0) fprintf(stderr, "write ELF image %s\n", filename);
nsinfo__mountns_enter(jd->nsi, &nsc); fd = open(filename, O_CREAT|O_TRUNC|O_WRONLY, 0644); saved_errno = errno; nsinfo__mountns_exit(&nsc); if (fd == -1) { errno = saved_errno; pr_warning("cannot create jit ELF %s: %m\n", filename); return -1; }
ret = jit_write_elf(fd, code_addr, sym, (const void *)code, csize, debug, nr_debug_entries, unwinding, unwinding_header_size, unwinding_size);
close(fd);
if (ret) { nsinfo__mountns_enter(jd->nsi, &nsc); unlink(filename); nsinfo__mountns_exit(&nsc); }
return ret;}
static voidjit_close(struct jit_buf_desc *jd){ if (!(jd && jd->in)) return; funlockfile(jd->in); fclose(jd->in); jd->in = NULL;}
static intjit_validate_events(struct perf_session *session){ struct evsel *evsel;
/* * check that all events use CLOCK_MONOTONIC */ evlist__for_each_entry(session->evlist, evsel) { if (evsel->core.attr.use_clockid == 0 || evsel->core.attr.clockid != CLOCK_MONOTONIC) return -1; } return 0;}
static intjit_open(struct jit_buf_desc *jd, const char *name){ struct jitheader header; struct nscookie nsc; struct jr_prefix *prefix; ssize_t bs, bsz = 0; void *n, *buf = NULL; int ret, retval = -1;
nsinfo__mountns_enter(jd->nsi, &nsc); jd->in = fopen(name, "r"); nsinfo__mountns_exit(&nsc); if (!jd->in) return -1;
bsz = hmax(sizeof(header), sizeof(*prefix));
buf = malloc(bsz); if (!buf) goto error;
/* * protect from writer modifying the file while we are reading it */ flockfile(jd->in);
ret = fread(buf, sizeof(header), 1, jd->in); if (ret != 1) goto error;
memcpy(&header, buf, sizeof(header));
if (header.magic != JITHEADER_MAGIC) { if (header.magic != JITHEADER_MAGIC_SW) goto error; jd->needs_bswap = true; }
if (jd->needs_bswap) { header.version = bswap_32(header.version); header.total_size = bswap_32(header.total_size); header.pid = bswap_32(header.pid); header.elf_mach = bswap_32(header.elf_mach); header.timestamp = bswap_64(header.timestamp); header.flags = bswap_64(header.flags); }
jd->use_arch_timestamp = header.flags & JITDUMP_FLAGS_ARCH_TIMESTAMP;
if (verbose > 2) pr_debug("version=%u\nhdr.size=%u\nts=0x%llx\npid=%d\nelf_mach=%d\nuse_arch_timestamp=%d\n", header.version, header.total_size, (unsigned long long)header.timestamp, header.pid, header.elf_mach, jd->use_arch_timestamp);
if (header.version > JITHEADER_VERSION) { pr_err("wrong jitdump version %u, expected " __stringify(JITHEADER_VERSION), header.version); goto error; }
if (header.flags & JITDUMP_FLAGS_RESERVED) { pr_err("jitdump file contains invalid or unsupported flags 0x%llx\n", (unsigned long long)header.flags & JITDUMP_FLAGS_RESERVED); goto error; }
if (jd->use_arch_timestamp && !jd->session->time_conv.time_mult) { pr_err("jitdump file uses arch timestamps but there is no timestamp conversion\n"); goto error; }
/* * validate event is using the correct clockid */ if (!jd->use_arch_timestamp && jit_validate_events(jd->session)) { pr_err("error, jitted code must be sampled with perf record -k 1\n"); goto error; }
bs = header.total_size - sizeof(header);
if (bs > bsz) { n = realloc(buf, bs); if (!n) goto error; bsz = bs; buf = n; /* read extra we do not know about */ ret = fread(buf, bs - bsz, 1, jd->in); if (ret != 1) goto error; } /* * keep dirname for generating files and mmap records */ strncpy(jd->dir, name, PATH_MAX - 1); jd->dir[PATH_MAX - 1] = '\0'; dirname(jd->dir); free(buf);
return 0;error: free(buf); funlockfile(jd->in); fclose(jd->in); return retval;}
static union jr_entry *jit_get_next_entry(struct jit_buf_desc *jd){ struct jr_prefix *prefix; union jr_entry *jr; void *addr; size_t bs, size; int id, ret;
if (!(jd && jd->in)) return NULL;
if (jd->buf == NULL) { size_t sz = getpagesize(); if (sz < sizeof(*prefix)) sz = sizeof(*prefix);
jd->buf = malloc(sz); if (jd->buf == NULL) return NULL;
jd->bufsize = sz; }
prefix = jd->buf;
/* * file is still locked at this point */ ret = fread(prefix, sizeof(*prefix), 1, jd->in); if (ret != 1) return NULL;
if (jd->needs_bswap) { prefix->id = bswap_32(prefix->id); prefix->total_size = bswap_32(prefix->total_size); prefix->timestamp = bswap_64(prefix->timestamp); } id = prefix->id; size = prefix->total_size;
bs = (size_t)size; if (bs < sizeof(*prefix)) return NULL;
if (id >= JIT_CODE_MAX) { pr_warning("next_entry: unknown record type %d, skipping\n", id); } if (bs > jd->bufsize) { void *n; n = realloc(jd->buf, bs); if (!n) return NULL; jd->buf = n; jd->bufsize = bs; }
addr = ((void *)jd->buf) + sizeof(*prefix);
ret = fread(addr, bs - sizeof(*prefix), 1, jd->in); if (ret != 1) return NULL;
jr = (union jr_entry *)jd->buf;
switch(id) { case JIT_CODE_DEBUG_INFO: if (jd->needs_bswap) { uint64_t n; jr->info.code_addr = bswap_64(jr->info.code_addr); jr->info.nr_entry = bswap_64(jr->info.nr_entry); for (n = 0 ; n < jr->info.nr_entry; n++) { jr->info.entries[n].addr = bswap_64(jr->info.entries[n].addr); jr->info.entries[n].lineno = bswap_32(jr->info.entries[n].lineno); jr->info.entries[n].discrim = bswap_32(jr->info.entries[n].discrim); } } break; case JIT_CODE_UNWINDING_INFO: if (jd->needs_bswap) { jr->unwinding.unwinding_size = bswap_64(jr->unwinding.unwinding_size); jr->unwinding.eh_frame_hdr_size = bswap_64(jr->unwinding.eh_frame_hdr_size); jr->unwinding.mapped_size = bswap_64(jr->unwinding.mapped_size); } break; case JIT_CODE_CLOSE: break; case JIT_CODE_LOAD: if (jd->needs_bswap) { jr->load.pid = bswap_32(jr->load.pid); jr->load.tid = bswap_32(jr->load.tid); jr->load.vma = bswap_64(jr->load.vma); jr->load.code_addr = bswap_64(jr->load.code_addr); jr->load.code_size = bswap_64(jr->load.code_size); jr->load.code_index= bswap_64(jr->load.code_index); } jd->code_load_count++; break; case JIT_CODE_MOVE: if (jd->needs_bswap) { jr->move.pid = bswap_32(jr->move.pid); jr->move.tid = bswap_32(jr->move.tid); jr->move.vma = bswap_64(jr->move.vma); jr->move.old_code_addr = bswap_64(jr->move.old_code_addr); jr->move.new_code_addr = bswap_64(jr->move.new_code_addr); jr->move.code_size = bswap_64(jr->move.code_size); jr->move.code_index = bswap_64(jr->move.code_index); } break; case JIT_CODE_MAX: default: /* skip unknown record (we have read them) */ break; } return jr;}
static intjit_inject_event(struct jit_buf_desc *jd, union perf_event *event){ ssize_t size;
size = perf_data__write(jd->output, event, event->header.size); if (size < 0) return -1;
jd->bytes_written += size; return 0;}
static pid_t jr_entry_pid(struct jit_buf_desc *jd, union jr_entry *jr){ if (jd->nsi && nsinfo__in_pidns(jd->nsi)) return nsinfo__tgid(jd->nsi); return jr->load.pid;}
static pid_t jr_entry_tid(struct jit_buf_desc *jd, union jr_entry *jr){ if (jd->nsi && nsinfo__in_pidns(jd->nsi)) return nsinfo__pid(jd->nsi); return jr->load.tid;}
static uint64_t convert_timestamp(struct jit_buf_desc *jd, uint64_t timestamp){ struct perf_tsc_conversion tc = { .time_shift = 0, }; struct perf_record_time_conv *time_conv = &jd->session->time_conv;
if (!jd->use_arch_timestamp) return timestamp;
tc.time_shift = time_conv->time_shift; tc.time_mult = time_conv->time_mult; tc.time_zero = time_conv->time_zero;
/* * The event TIME_CONV was extended for the fields from "time_cycles" * when supported cap_user_time_short, for backward compatibility, * checks the event size and assigns these extended fields if these * fields are contained in the event. */ if (event_contains(*time_conv, cap_user_time_short)) { tc.time_cycles = time_conv->time_cycles; tc.time_mask = time_conv->time_mask; tc.cap_user_time_zero = time_conv->cap_user_time_zero; tc.cap_user_time_short = time_conv->cap_user_time_short;
if (!tc.cap_user_time_zero) return 0; }
return tsc_to_perf_time(timestamp, &tc);}
static int jit_repipe_code_load(struct jit_buf_desc *jd, union jr_entry *jr){ struct perf_sample sample; union perf_event *event; const struct perf_tool *tool = jd->session->tool; uint64_t code, addr; uintptr_t uaddr; char *filename; struct stat st; size_t size; u16 idr_size; const char *sym; uint64_t count; int ret, csize, usize; pid_t nspid, pid, tid; struct { u32 pid, tid; u64 time; } *id;
nspid = jr->load.pid; pid = jr_entry_pid(jd, jr); tid = jr_entry_tid(jd, jr); csize = jr->load.code_size; usize = jd->unwinding_mapped_size; addr = jr->load.code_addr; sym = (void *)((unsigned long)jr + sizeof(jr->load)); code = (unsigned long)jr + jr->load.p.total_size - csize; count = jr->load.code_index; idr_size = jd->machine->id_hdr_size;
event = calloc(1, sizeof(*event) + idr_size); if (!event) return -1;
filename = event->mmap2.filename; size = snprintf(filename, PATH_MAX, "%s/jitted-%d-%" PRIu64 ".so", jd->dir, nspid, count);
size++; /* for \0 */
size = PERF_ALIGN(size, sizeof(u64)); uaddr = (uintptr_t)code; ret = jit_emit_elf(jd, filename, sym, addr, (const void *)uaddr, csize, jd->debug_data, jd->nr_debug_entries, jd->unwinding_data, jd->eh_frame_hdr_size, jd->unwinding_size);
if (jd->debug_data && jd->nr_debug_entries) { zfree(&jd->debug_data); jd->nr_debug_entries = 0; }
if (jd->unwinding_data && jd->eh_frame_hdr_size) { zfree(&jd->unwinding_data); jd->eh_frame_hdr_size = 0; jd->unwinding_mapped_size = 0; jd->unwinding_size = 0; }
if (ret) { free(event); return -1; } if (nsinfo__stat(filename, &st, jd->nsi)) memset(&st, 0, sizeof(st));
event->mmap2.header.type = PERF_RECORD_MMAP2; event->mmap2.header.misc = PERF_RECORD_MISC_USER; event->mmap2.header.size = (sizeof(event->mmap2) - (sizeof(event->mmap2.filename) - size) + idr_size);
event->mmap2.pgoff = GEN_ELF_TEXT_OFFSET; event->mmap2.start = addr; event->mmap2.len = usize ? ALIGN_8(csize) + usize : csize; event->mmap2.pid = pid; event->mmap2.tid = tid; event->mmap2.ino = st.st_ino; event->mmap2.maj = major(st.st_dev); event->mmap2.min = minor(st.st_dev); event->mmap2.prot = st.st_mode; event->mmap2.flags = MAP_SHARED; event->mmap2.ino_generation = 1;
id = (void *)((unsigned long)event + event->mmap.header.size - idr_size); if (jd->sample_type & PERF_SAMPLE_TID) { id->pid = pid; id->tid = tid; } if (jd->sample_type & PERF_SAMPLE_TIME) id->time = convert_timestamp(jd, jr->load.p.timestamp);
/* * create pseudo sample to induce dso hit increment * use first address as sample address */ perf_sample__init(&sample, /*all=*/true); sample.cpumode = PERF_RECORD_MISC_USER; sample.pid = pid; sample.tid = tid; sample.time = id->time; sample.ip = addr;
ret = perf_event__process_mmap2(tool, event, &sample, jd->machine); if (ret) goto out;
ret = jit_inject_event(jd, event); /* * mark dso as use to generate buildid in the header */ if (!ret) { struct dso_id dso_id = { { .maj = event->mmap2.maj, .min = event->mmap2.min, .ino = event->mmap2.ino, .ino_generation = event->mmap2.ino_generation, }, .mmap2_valid = true, .mmap2_ino_generation_valid = true, }; struct dso *dso = machine__findnew_dso_id(jd->machine, filename, &dso_id);
if (dso) dso__set_hit(dso);
dso__put(dso); }out: perf_sample__exit(&sample); free(event); return ret;}
static int jit_repipe_code_move(struct jit_buf_desc *jd, union jr_entry *jr){ struct perf_sample sample; union perf_event *event; const struct perf_tool *tool = jd->session->tool; char *filename; size_t size; struct stat st; int usize; u16 idr_size; int ret; pid_t nspid, pid, tid; struct { u32 pid, tid; u64 time; } *id;
nspid = jr->load.pid; pid = jr_entry_pid(jd, jr); tid = jr_entry_tid(jd, jr); usize = jd->unwinding_mapped_size; idr_size = jd->machine->id_hdr_size;
/* * +16 to account for sample_id_all (hack) */ event = calloc(1, sizeof(*event) + 16); if (!event) return -1;
filename = event->mmap2.filename; size = snprintf(filename, PATH_MAX, "%s/jitted-%d-%" PRIu64 ".so", jd->dir, nspid, jr->move.code_index);
size++; /* for \0 */
if (nsinfo__stat(filename, &st, jd->nsi)) memset(&st, 0, sizeof(st));
size = PERF_ALIGN(size, sizeof(u64));
event->mmap2.header.type = PERF_RECORD_MMAP2; event->mmap2.header.misc = PERF_RECORD_MISC_USER; event->mmap2.header.size = (sizeof(event->mmap2) - (sizeof(event->mmap2.filename) - size) + idr_size); event->mmap2.pgoff = GEN_ELF_TEXT_OFFSET; event->mmap2.start = jr->move.new_code_addr; event->mmap2.len = usize ? ALIGN_8(jr->move.code_size) + usize : jr->move.code_size; event->mmap2.pid = pid; event->mmap2.tid = tid; event->mmap2.ino = st.st_ino; event->mmap2.maj = major(st.st_dev); event->mmap2.min = minor(st.st_dev); event->mmap2.prot = st.st_mode; event->mmap2.flags = MAP_SHARED; event->mmap2.ino_generation = 1;
id = (void *)((unsigned long)event + event->mmap.header.size - idr_size); if (jd->sample_type & PERF_SAMPLE_TID) { id->pid = pid; id->tid = tid; } if (jd->sample_type & PERF_SAMPLE_TIME) id->time = convert_timestamp(jd, jr->load.p.timestamp);
/* * create pseudo sample to induce dso hit increment * use first address as sample address */ perf_sample__init(&sample, /*all=*/true); sample.cpumode = PERF_RECORD_MISC_USER; sample.pid = pid; sample.tid = tid; sample.time = id->time; sample.ip = jr->move.new_code_addr;
ret = perf_event__process_mmap2(tool, event, &sample, jd->machine); if (ret) goto out;
ret = jit_inject_event(jd, event); if (!ret) build_id__mark_dso_hit(tool, event, &sample, jd->machine);out: perf_sample__exit(&sample); return ret;}
static int jit_repipe_debug_info(struct jit_buf_desc *jd, union jr_entry *jr){ void *data; size_t sz;
if (!(jd && jr)) return -1;
sz = jr->prefix.total_size - sizeof(jr->info); data = malloc(sz); if (!data) return -1;
memcpy(data, &jr->info.entries, sz);
jd->debug_data = data;
/* * we must use nr_entry instead of size here because * we cannot distinguish actual entry from padding otherwise */ jd->nr_debug_entries = jr->info.nr_entry;
return 0;}
static intjit_repipe_unwinding_info(struct jit_buf_desc *jd, union jr_entry *jr){ void *unwinding_data; uint32_t unwinding_data_size;
if (!(jd && jr)) return -1;
unwinding_data_size = jr->prefix.total_size - sizeof(jr->unwinding); unwinding_data = malloc(unwinding_data_size); if (!unwinding_data) return -1;
memcpy(unwinding_data, &jr->unwinding.unwinding_data, unwinding_data_size);
jd->eh_frame_hdr_size = jr->unwinding.eh_frame_hdr_size; jd->unwinding_size = jr->unwinding.unwinding_size; jd->unwinding_mapped_size = jr->unwinding.mapped_size; free(jd->unwinding_data); jd->unwinding_data = unwinding_data;
return 0;}
static intjit_process_dump(struct jit_buf_desc *jd){ union jr_entry *jr; int ret = 0;
while ((jr = jit_get_next_entry(jd))) { switch(jr->prefix.id) { case JIT_CODE_LOAD: ret = jit_repipe_code_load(jd, jr); break; case JIT_CODE_MOVE: ret = jit_repipe_code_move(jd, jr); break; case JIT_CODE_DEBUG_INFO: ret = jit_repipe_debug_info(jd, jr); break; case JIT_CODE_UNWINDING_INFO: ret = jit_repipe_unwinding_info(jd, jr); break; default: ret = 0; continue; } } return ret;}
static intjit_inject(struct jit_buf_desc *jd, const char *path){ int ret;
if (verbose > 0) fprintf(stderr, "injecting: %s\n", path);
ret = jit_open(jd, path); if (ret) return -1;
ret = jit_process_dump(jd);
jit_close(jd);
if (verbose > 0) fprintf(stderr, "injected: %s (%d)\n", path, ret);
return 0;}
/* * File must be with pattern .../jit-XXXX.dump * where XXXX is the PID of the process which did the mmap() * as captured in the RECORD_MMAP record */static intjit_detect(const char *mmap_name, pid_t pid, struct nsinfo *nsi, bool *in_pidns) { const char *p; char *end = NULL; pid_t pid2;
if (verbose > 2) fprintf(stderr, "jit marker trying : %s\n", mmap_name); /* * get file name */ p = strrchr(mmap_name, '/'); if (!p) return -1;
/* * match prefix */ if (strncmp(p, "/jit-", 5)) return -1;
/* * skip prefix */ p += 5;
/* * must be followed by a pid */ if (!isdigit(*p)) return -1;
pid2 = (int)strtol(p, &end, 10); if (!end) return -1;
*in_pidns = pid == nsinfo__nstgid(nsi); /* * pid does not match mmap pid * pid==0 in system-wide mode (synthesized) * * If the pid in the file name is equal to the nstgid, then * the agent ran inside a container and perf outside the * container, so record it for further use in jit_inject(). */ if (pid && !(pid2 == pid || *in_pidns)) return -1; /* * validate suffix */ if (strcmp(end, ".dump")) return -1;
if (verbose > 0) fprintf(stderr, "jit marker found: %s\n", mmap_name);
return 0;}
static void jit_add_pid(struct machine *machine, pid_t pid){ struct thread *thread = machine__findnew_thread(machine, pid, pid);
if (!thread) { pr_err("%s: thread %d not found or created\n", __func__, pid); return; }
thread__set_priv(thread, (void *)true); thread__put(thread);}
static bool jit_has_pid(struct machine *machine, pid_t pid){ struct thread *thread = machine__find_thread(machine, pid, pid); void *priv;
if (!thread) return false;
priv = thread__priv(thread); thread__put(thread); return (bool)priv;}
intjit_process(struct perf_session *session, struct perf_data *output, struct machine *machine, const char *filename, pid_t pid, pid_t tid, u64 *nbytes){ struct thread *thread; struct nsinfo *nsi; struct evsel *first; struct jit_buf_desc jd; bool in_pidns = false; int ret;
thread = machine__findnew_thread(machine, pid, tid); if (thread == NULL) { pr_err("problem processing JIT mmap event, skipping it.\n"); return 0; }
nsi = nsinfo__get(thread__nsinfo(thread)); thread__put(thread);
/* * first, detect marker mmap (i.e., the jitdump mmap) */ if (jit_detect(filename, pid, nsi, &in_pidns)) { nsinfo__put(nsi);
/* * Strip //anon*, [anon:* and /memfd:* mmaps if we processed a jitdump for this pid */ if (jit_has_pid(machine, pid) && ((strncmp(filename, "//anon", 6) == 0) || (strncmp(filename, "[anon:", 6) == 0) || (strncmp(filename, "/memfd:", 7) == 0))) return 1;
return 0; }
memset(&jd, 0, sizeof(jd));
jd.session = session; jd.output = output; jd.machine = machine; jd.nsi = nsi;
if (in_pidns) nsinfo__set_in_pidns(nsi);
/* * track sample_type to compute id_all layout * perf sets the same sample type to all events as of now */ first = evlist__first(session->evlist); jd.sample_type = first->core.attr.sample_type;
*nbytes = 0;
ret = jit_inject(&jd, filename); if (!ret) { jit_add_pid(machine, pid); *nbytes = jd.bytes_written; ret = 1; }
nsinfo__put(jd.nsi); free(jd.buf);
return ret;}