mirror of
https://github.com/jart/cosmopolitan.git
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e56a9d0e23
This change brings page faults for precompressed static asset serving down from 27 to 20 (or fewer) after fork. This is more of an art than science. Hopefully Blinkenlights can visualize page faults soon.
124 lines
4.9 KiB
C
124 lines
4.9 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/alg/bisectcarleft.internal.h"
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#include "libc/bits/bits.h"
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#include "libc/bits/safemacros.internal.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/internal.h"
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#include "libc/calls/struct/sigset.h"
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#include "libc/dce.h"
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#include "libc/fmt/itoa.h"
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#include "libc/intrin/repmovsb.h"
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#include "libc/macros.internal.h"
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#include "libc/nexgen32e/rdtsc.h"
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#include "libc/nexgen32e/rdtscp.h"
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#include "libc/nexgen32e/stackframe.h"
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#include "libc/nexgen32e/x86feature.h"
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#include "libc/nt/files.h"
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#include "libc/nt/runtime.h"
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#include "libc/nt/thunk/msabi.h"
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#include "libc/runtime/internal.h"
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#include "libc/runtime/runtime.h"
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#include "libc/runtime/symbols.internal.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/fileno.h"
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#include "libc/sysv/consts/nr.h"
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#include "libc/sysv/consts/prot.h"
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#include "libc/sysv/consts/sig.h"
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/**
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* @fileoverview Plain-text function call logging.
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*
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* Able to log ~2 million function calls per second, which is mostly
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* bottlenecked by system call overhead. Log size is reasonable if piped
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* into gzip.
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*/
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void ftrace_hook(void);
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static int noreentry;
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static uint64_t laststamp;
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static char g_buf[512];
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static const char *g_lastsymbol;
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static struct SymbolTable *g_symbols;
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static noasan int GetNestingLevel(struct StackFrame *frame) {
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int nesting = -2;
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while (frame) {
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++nesting;
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frame = frame->next;
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}
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return max(0, nesting);
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}
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/**
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* Prints name of function being called.
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*
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* We insert CALL instructions that point to this function, in the
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* prologues of other functions. We assume those functions behave
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* according to the System Five NexGen32e ABI.
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*/
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privileged noasan void ftrace(void) {
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char *p;
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uint64_t stamp;
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const char *symbol;
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struct StackFrame *frame;
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size_t nesting, symbolsize;
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if (!cmpxchg(&noreentry, 0, 1)) return;
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if (g_symbols) {
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stamp = rdtsc();
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frame = __builtin_frame_address(0);
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frame = frame->next;
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symbol =
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&g_symbols->name_base[g_symbols
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->symbols[bisectcarleft(
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(const int32_t(*)[2])g_symbols->symbols,
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g_symbols->count,
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frame->addr - g_symbols->addr_base)]
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.name_rva];
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if (symbol != g_lastsymbol) {
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symbolsize = strlen(symbol);
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nesting = GetNestingLevel(frame);
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if (2 + nesting * 2 + symbolsize + 1 + 21 + 2 <= ARRAYLEN(g_buf)) {
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p = g_buf;
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*p++ = '+';
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*p++ = ' ';
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memset(p, ' ', nesting * 2);
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p += nesting * 2;
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p = mempcpy(p, symbol, symbolsize);
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*p++ = ' ';
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p += uint64toarray_radix10((stamp - laststamp) / 3.3, p);
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*p++ = '\r';
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*p++ = '\n';
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write(2, g_buf, p - g_buf);
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}
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}
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g_lastsymbol = symbol;
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laststamp = X86_HAVE(RDTSCP) ? rdtscp(0) : rdtsc();
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}
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noreentry = 0;
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}
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textstartup void ftrace_install(void) {
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if ((g_symbols = OpenSymbolTable(FindDebugBinary()))) {
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__hook(ftrace_hook, g_symbols);
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} else {
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write(2, "error: --ftrace needs the concomitant .com.dbg binary\n", 54);
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}
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}
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