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authorSong Liu <songliubraving@fb.com>2019-09-23 15:38:22 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2019-09-24 15:54:11 -0700
commitfb4fb04ff4dd377b3132e9b31259263ec37b830a (patch)
tree92139b2f893e8bb0dd15e801a022dd46b83cc7a4 /mm
parent010c164a5fa7e169deab0a4d8211611f1930c1cd (diff)
uprobe: use original page when all uprobes are removed
Currently, uprobe swaps the target page with a anonymous page in both install_breakpoint() and remove_breakpoint(). When all uprobes on a page are removed, the given mm is still using an anonymous page (not the original page). This patch allows uprobe to use original page when possible (all uprobes on the page are already removed, and the original page is in page cache and uptodate). As suggested by Oleg, we unmap the old_page and let the original page fault in. Link: http://lkml.kernel.org/r/20190815164525.1848545-3-songliubraving@fb.com Signed-off-by: Song Liu <songliubraving@fb.com> Suggested-by: Oleg Nesterov <oleg@redhat.com> Reviewed-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
0 files changed, 0 insertions, 0 deletions