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b2b78d2f8a
This adds a kernel-level performance profiler for the VFS. By enabling CONFIG_FS_PROFILER, the core VFS system calls (file_read, file_write, file_open, and file_close) are instrumented to track high-resolution execution times using clock_systime_timespec() seamlessly. The collected statistics are exposed dynamically via a new procfs node at /proc/fs/profile, allowing CI regression testing without needing external debugging tools. Signed-off-by: Sumit6307 <sumitkesar6307@gmail.com>
114 lines
3.7 KiB
C
114 lines
3.7 KiB
C
/****************************************************************************
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* fs/procfs/fs_procfsprofile.c
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#if defined(CONFIG_FS_PROCFS) && defined(CONFIG_FS_PROFILER) && \
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defined(CONFIG_FS_PROCFS_PROFILER)
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <stdio.h>
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#include <string.h>
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#include <inttypes.h>
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#include <nuttx/fs/fs.h>
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#include <nuttx/fs/procfs.h>
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#include "../vfs/vfs.h"
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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static int profile_open(FAR struct file *filep, FAR const char *relpath,
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int oflags, mode_t mode)
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{
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return OK;
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}
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static int profile_close(FAR struct file *filep)
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{
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return OK;
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}
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static ssize_t profile_read(FAR struct file *filep, FAR char *buffer,
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size_t buflen)
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{
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char buf[256];
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size_t linesize;
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procfs_snprintf(buf, sizeof(buf),
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"FS Performance Profile:\n"
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" Reads: %10" PRId32 " (Total time: %" PRId64 " ns)\n"
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" Writes: %10" PRId32 " (Total time: %" PRId64 " ns)\n"
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" Opens: %10" PRId32 " (Total time: %" PRId64 " ns)\n"
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" Closes: %10" PRId32 " (Total time: %" PRId64 " ns)\n",
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atomic_read(&g_fs_profile.reads),
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atomic64_read(&g_fs_profile.total_read_time),
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atomic_read(&g_fs_profile.writes),
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atomic64_read(&g_fs_profile.total_write_time),
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atomic_read(&g_fs_profile.opens),
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atomic64_read(&g_fs_profile.total_open_time),
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atomic_read(&g_fs_profile.closes),
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atomic64_read(&g_fs_profile.total_close_time));
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linesize = strlen(buf);
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return procfs_memcpy(buf, linesize, buffer, buflen, &filep->f_pos);
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}
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static int profile_dup(FAR const struct file *oldp, FAR struct file *newp)
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{
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return OK;
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}
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static int profile_stat(FAR const char *relpath, FAR struct stat *buf)
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{
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memset(buf, 0, sizeof(struct stat));
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buf->st_mode = S_IFREG | S_IROTH | S_IRGRP | S_IRUSR;
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return OK;
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}
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/****************************************************************************
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* Public Data
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****************************************************************************/
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const struct procfs_operations g_fsprofile_operations =
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{
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profile_open, /* open */
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profile_close, /* close */
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profile_read, /* read */
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NULL, /* write */
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NULL, /* poll */
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profile_dup, /* dup */
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NULL, /* opendir */
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NULL, /* closedir */
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NULL, /* readdir */
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NULL, /* rewinddir */
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profile_stat /* stat */
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};
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#endif
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