try_to_writeback_inodes_sb_nr – try to start writeback if none underway Synopsis bool try_to_writeback_inodes_sb_nr(struct super_block * sb, unsigned long nr, enum wb_reason reason); Arguments sb the superblock nr the number of pages to write reason the reason of writeback Description Invoke writeback_inodes_sb_nr if no writeback is currently underway. Returns 1 if writeback was started, 0 if not. Copyright
try_to_writeback_inodes_sb – try to start writeback if none underway Synopsis bool try_to_writeback_inodes_sb(struct super_block * sb, enum wb_reason reason); Arguments sb the superblock reason reason why some writeback work was initiated Description Implement by try_to_writeback_inodes_sb_nr Returns 1 if writeback was started, 0 if not. Copyright
try_to_release_page – release old fs-specific metadata on a page Synopsis int try_to_release_page(struct page *page, gfp_t gfp_mask); Arguments page the page which the kernel is trying to free gfp_mask memory allocation flags (and I/O mode) Description The address_space is to try to release any data against the page (presumably at page->private). If the release was successful,…
truncate_setsize – update inode and pagecache for a new file size Synopsis void truncate_setsize(struct inode *inode, loff_t newsize); Arguments inode inode newsize new file size Description truncate_setsize updates i_size and performs pagecache truncation (if necessary) to newsize. It will be typically be called from the filesystem’s setattr function when ATTR_SIZE is passed in. Must be…
truncate_pagecache_range – unmap and remove pagecache that is hole-punched Synopsis void truncate_pagecache_range(struct inode *inode, loff_t lstart, loff_t lend); Arguments inode inode lstart offset of beginning of hole lend offset of last byte of hole Description This function should typically be called before the filesystem releases resources associated with the freed range (eg. deallocates blocks). This…
truncate_pagecache – unmap and remove pagecache that has been truncated Synopsis void truncate_pagecache(struct inode *inode, loff_t newsize); Arguments inode inode newsize new file size Description inode’s new i_size must already be written before truncate_pagecache is called. This function should typically be called before the filesystem releases resources associated with the freed range (eg. deallocates blocks)….
truncate_inode_pages_range – truncate range of pages specified by start & end byte offsets Synopsis void truncate_inode_pages_range(struct address_space *mapping, loff_t lstart, loff_t lend); Arguments mapping mapping to truncate lstart offset from which to truncate lend offset to which to truncate (inclusive) Description Truncate the page cache, removing the pages that are between specified offsets (and zeroing…
truncate_inode_pages_final – truncate *all* pages before inode dies Synopsis void truncate_inode_pages_final(struct address_space *mapping); Arguments mapping mapping to truncate Description Called under (and serialized by) inode->i_mutex. Filesystems have to use this in the .evict_inode path to inform the VM that this is the final truncate and the inode is going away. Copyright
truncate_inode_pages – truncate *all* the pages from an offset Synopsis void truncate_inode_pages(struct address_space *mapping, loff_t lstart); Arguments mapping mapping to truncate lstart offset from which to truncate Description Called under (and serialised by) inode->i_mutex. Note When this function returns, there can be a page in the process of deletion (inside __delete_from_page_cache) in the specified range….
trace_workqueue_queue_work – called when a work gets queued Synopsis void trace_workqueue_queue_work(unsigned int req_cpu, struct pool_workqueue *pwq, struct work_struct *work); Arguments req_cpu the requested cpu pwq pointer to struct pool_workqueue work pointer to struct work_struct Description This event occurs when a work is queued immediately or once a delayed work is actually queued on a workqueue…
trace_workqueue_execute_start – called immediately before the workqueue callback Synopsis void trace_workqueue_execute_start(struct work_struct *work); Arguments work pointer to struct work_struct Description Allows to track workqueue execution. Authors Jason Baron <jbaron [at] redhat.com> Author. William Cohen <wcohen [at] redhat.com> Author. Copyright
trace_workqueue_execute_end – called immediately after the workqueue callback Synopsis void trace_workqueue_execute_end(struct work_struct *work); Arguments work pointer to struct work_struct Description Allows to track workqueue execution. Authors Jason Baron <jbaron [at] redhat.com> Author. William Cohen <wcohen [at] redhat.com> Author. Copyright
trace_workqueue_activate_work – called when a work gets activated Synopsis void trace_workqueue_activate_work(struct work_struct *work); Arguments work pointer to struct work_struct Description This event occurs when a queued work is put on the active queue, which happens immediately after queueing unless max_active limit is reached. Authors Jason Baron <jbaron [at] redhat.com> Author. William Cohen <wcohen [at] redhat.com>…
trace_softirq_raise – called immediately when a softirq is raised Synopsis void trace_softirq_raise(unsigned int vec_nr); Arguments vec_nr softirq vector number Description When used in combination with the softirq_entry tracepoint we can determine the softirq raise to run latency. Authors Jason Baron <jbaron [at] redhat.com> Author. William Cohen <wcohen [at] redhat.com> Author. Copyright
trace_softirq_exit – called immediately after the softirq handler returns Synopsis void trace_softirq_exit(unsigned int vec_nr); Arguments vec_nr softirq vector number Description When used in combination with the softirq_entry tracepoint we can determine the softirq handler routine. Authors Jason Baron <jbaron [at] redhat.com> Author. William Cohen <wcohen [at] redhat.com> Author. Copyright
trace_softirq_entry – called immediately before the softirq handler Synopsis void trace_softirq_entry(unsigned int vec_nr); Arguments vec_nr softirq vector number Description When used in combination with the softirq_exit tracepoint we can determine the softirq handler routine. Authors Jason Baron <jbaron [at] redhat.com> Author. William Cohen <wcohen [at] redhat.com> Author. Copyright
trace_signal_generate – called when a signal is generated Synopsis void trace_signal_generate(int sig, struct siginfo *info, struct task_struct *task, int group, int result); Arguments sig signal number info pointer to struct siginfo task pointer to struct task_struct group shared or private result TRACE_SIGNAL_* Description Current process sends a ‘sig’ signal to ‘task’ process with ‘info’ siginfo….
trace_signal_deliver – called when a signal is delivered Synopsis void trace_signal_deliver(int sig, struct siginfo *info, struct k_sigaction *ka); Arguments sig signal number info pointer to struct siginfo ka pointer to struct k_sigaction Description A ‘sig’ signal is delivered to current process with ‘info’ siginfo, and it will be handled by ‘ka’. ka->sa.sa_handler can be SIG_IGN…
trace_irq_handler_exit – called immediately after the irq action handler returns Synopsis void trace_irq_handler_exit(int irq, struct irqaction *action, int ret); Arguments irq irq number action pointer to struct irqaction ret return value Description If the ret value is set to IRQ_HANDLED, then we know that the corresponding action->handler successfully handled this irq. Otherwise, the irq might…
trace_irq_handler_entry – called immediately before the irq action handler Synopsis void trace_irq_handler_entry(int irq, struct irqaction *action); Arguments irq irq number action pointer to struct irqaction Description The struct irqaction pointed to by action contains various information about the handler, including the device name, action->name, and the device id, action->dev_id. When used in conjunction with the…