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The LITMUS^RT kernel.

Bjoern Brandenburg

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author	Suresh Siddha <suresh.b.siddha@intel.com>	2007-07-19 15:28:35 -0400
committer	Ingo Molnar <mingo@elte.hu>	2007-07-19 15:28:35 -0400
commit	9439aab8dbc33c2c03c3a19dba267360383ba38c (patch)
tree	b6405b709b7bf60216290f9d81aec133faea6adf /drivers/net/ppp_mppe.c
parent	c41917df8a1adde34864116ce2231a7fe308d2ff (diff)

[PATCH] sched: fix newly idle load balance in case of SMT

In the presence of SMT, newly idle balance was never happening for multi-core and SMP domains (even when both the logical siblings are idle). If thread 0 is already idle and when thread 1 is about to go to idle, newly idle load balance always think that one of the threads is not idle and skips doing the newly idle load balance for multi-core and SMP domains. This is because of the idle_cpu() macro, which checks if the current process on a cpu is an idle process. But this is not the case for the thread doing the load_balance_newidle(). Fix this by using runqueue's nr_running field instead of idle_cpu(). And also skip the logic of 'only one idle cpu in the group will be doing load balancing' during newly idle case. Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>

Diffstat (limited to 'drivers/net/ppp_mppe.c')

0 files changed, 0 insertions, 0 deletions

little-endian byte-swapping/bitmaps by * David S. Miller (davem@caip.rutgers.edu), 1995 * * Removed unnecessary code duplication for little endian machines * and excessive __inline__s. * Andi Kleen, 1997 * * Major simplications and cleanup - we only need to do the metadata, because * we can depend on generic_block_fdatasync() to sync the data blocks. */ #include <linux/time.h> #include <linux/fs.h> #include <linux/sched.h> #include <linux/writeback.h> #include <linux/jbd2.h> #include <linux/blkdev.h> #include "ext4.h" #include "ext4_jbd2.h" #include <trace/events/ext4.h> /* * akpm: A new design for ext4_sync_file(). * * This is only called from sys_fsync(), sys_fdatasync() and sys_msync(). * There cannot be a transaction open by this task. * Another task could have dirtied this inode. Its data can be in any * state in the journalling system. * * What we do is just kick off a commit and wait on it. This will snapshot the * inode to disk. * * i_mutex lock is held when entering and exiting this function */ int ext4_sync_file(struct file *file, struct dentry *dentry, int datasync) { struct inode *inode = dentry->d_inode; journal_t *journal = EXT4_SB(inode->i_sb)->s_journal; int err, ret = 0; J_ASSERT(ext4_journal_current_handle() == NULL); trace_ext4_sync_file(file, dentry, datasync); ret = flush_aio_dio_completed_IO(inode); if (ret < 0) goto out; /* * data=writeback: * The caller's filemap_fdatawrite()/wait will sync the data. * sync_inode() will sync the metadata * * data=ordered: * The caller's filemap_fdatawrite() will write the data and * sync_inode() will write the inode if it is dirty. Then the caller's * filemap_fdatawait() will wait on the pages. * * data=journal: * filemap_fdatawrite won't do anything (the buffers are clean). * ext4_force_commit will write the file data into the journal and * will wait on that. * filemap_fdatawait() will encounter a ton of newly-dirtied pages * (they were dirtied by commit). But that's OK - the blocks are * safe in-journal, which is all fsync() needs to ensure. */ if (ext4_should_journal_data(inode)) { ret = ext4_force_commit(inode->i_sb); goto out; } if (!journal) ret = sync_mapping_buffers(inode->i_mapping); if (datasync && !(inode->i_state & I_DIRTY_DATASYNC)) goto out; /* * The VFS has written the file data. If the inode is unaltered * then we need not start a commit. */ if (inode->i_state & (I_DIRTY_SYNC|I_DIRTY_DATASYNC)) { struct writeback_control wbc = { .sync_mode = WB_SYNC_ALL, .nr_to_write = 0, /* sys_fsync did this */ }; err = sync_inode(inode, &wbc); if (ret == 0) ret = err; } out: if (journal && (journal->j_flags & JBD2_BARRIER)) blkdev_issue_flush(inode->i_sb->s_bdev, NULL); return ret; }