From be1c7e50e1e8809ea56f2c9d472eccd8ffd73a97 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Fri, 19 Apr 2024 04:57:58 +0200 Subject: Adding upstream version 1.44.3. Signed-off-by: Daniel Baumann --- .../systemd-journal.plugin/systemd-journal-fstat.c | 74 ++++++++++++++++++++++ 1 file changed, 74 insertions(+) create mode 100644 collectors/systemd-journal.plugin/systemd-journal-fstat.c (limited to 'collectors/systemd-journal.plugin/systemd-journal-fstat.c') diff --git a/collectors/systemd-journal.plugin/systemd-journal-fstat.c b/collectors/systemd-journal.plugin/systemd-journal-fstat.c new file mode 100644 index 00000000..45ea7817 --- /dev/null +++ b/collectors/systemd-journal.plugin/systemd-journal-fstat.c @@ -0,0 +1,74 @@ +// SPDX-License-Identifier: GPL-3.0-or-later + +#include "systemd-internals.h" + + +// ---------------------------------------------------------------------------- +// fstat64 overloading to speed up libsystemd +// https://github.com/systemd/systemd/pull/29261 + +#include +#include + +#define FSTAT_CACHE_MAX 1024 +struct fdstat64_cache_entry { + bool enabled; + bool updated; + int err_no; + struct stat64 stat; + int ret; + size_t cached_count; + size_t session; +}; + +struct fdstat64_cache_entry fstat64_cache[FSTAT_CACHE_MAX] = {0 }; +__thread size_t fstat_thread_calls = 0; +__thread size_t fstat_thread_cached_responses = 0; +static __thread bool enable_thread_fstat = false; +static __thread size_t fstat_caching_thread_session = 0; +static size_t fstat_caching_global_session = 0; + +void fstat_cache_enable_on_thread(void) { + fstat_caching_thread_session = __atomic_add_fetch(&fstat_caching_global_session, 1, __ATOMIC_ACQUIRE); + enable_thread_fstat = true; +} + +void fstat_cache_disable_on_thread(void) { + fstat_caching_thread_session = __atomic_add_fetch(&fstat_caching_global_session, 1, __ATOMIC_RELEASE); + enable_thread_fstat = false; +} + +int fstat64(int fd, struct stat64 *buf) { + static int (*real_fstat)(int, struct stat64 *) = NULL; + if (!real_fstat) + real_fstat = dlsym(RTLD_NEXT, "fstat64"); + + fstat_thread_calls++; + + if(fd >= 0 && fd < FSTAT_CACHE_MAX) { + if(enable_thread_fstat && fstat64_cache[fd].session != fstat_caching_thread_session) { + fstat64_cache[fd].session = fstat_caching_thread_session; + fstat64_cache[fd].enabled = true; + fstat64_cache[fd].updated = false; + } + + if(fstat64_cache[fd].enabled && fstat64_cache[fd].updated && fstat64_cache[fd].session == fstat_caching_thread_session) { + fstat_thread_cached_responses++; + errno = fstat64_cache[fd].err_no; + *buf = fstat64_cache[fd].stat; + fstat64_cache[fd].cached_count++; + return fstat64_cache[fd].ret; + } + } + + int ret = real_fstat(fd, buf); + + if(fd >= 0 && fd < FSTAT_CACHE_MAX && fstat64_cache[fd].enabled && fstat64_cache[fd].session == fstat_caching_thread_session) { + fstat64_cache[fd].ret = ret; + fstat64_cache[fd].updated = true; + fstat64_cache[fd].err_no = errno; + fstat64_cache[fd].stat = *buf; + } + + return ret; +} -- cgit v1.2.3