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If a transaction log reservation overrun occurs, the ticket data associated with the reservation is dumped in xfs_log_commit_cil(). This occurs long after the transaction items and details have been removed from the transaction and effectively lost. This limited set of ticket data provides very little information to support debugging transaction overruns based on the typical report. To improve transaction log reservation overrun reporting, create a helper to dump transaction details such as log items, log vector data, etc., as well as the underlying ticket data for the transaction. Move the overrun detection from xfs_log_commit_cil() to xlog_cil_insert_items() so it occurs prior to migration of the logged items to the CIL. Call the new helper such that it is able to dump this transaction data before it is lost. Also, warn on overrun to provide callstack context for the offending transaction and include a few additional messages from xlog_cil_insert_items() to display the reservation consumed locally for overhead such as log vector headers, split region headers and the context ticket. This provides a complete general breakdown of the reservation consumption of a transaction when/if it happens to overrun the reservation. Signed-off-by: Brian Foster <bfoster@redhat.com> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.