lkml.org 
[lkml]   [2009]   [Dec]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    Date
    From
    Subject[RFC PATCH -tip 1/1] tracepoints: add tracepoints for pagecache
    This patch adds several tracepoints to track pagecach behavior.
    These trecepoints would help us monitor pagecache usage with high resolution.

    Signed-off-by: Keiichi Kii <k-keiichi@bx.jp.nec.com>
    Cc: Atsushi Tsuji <a-tsuji@bk.jp.nec.com>
    ---
    include/trace/events/filemap.h | 83 +++++++++++++++++++++++++++++++++++++++++
    mm/filemap.c | 5 ++
    mm/truncate.c | 2
    mm/vmscan.c | 3 +
    4 files changed, 93 insertions(+)

    Index: linux-2.6-tip/include/trace/events/filemap.h
    ===================================================================
    --- /dev/null
    +++ linux-2.6-tip/include/trace/events/filemap.h
    @@ -0,0 +1,83 @@
    +#undef TRACE_SYSTEM
    +#define TRACE_SYSTEM filemap
    +
    +#if !defined(_TRACE_FILEMAP_H) || defined(TRACE_HEADER_MULTI_READ)
    +#define _TRACE_FILEMAP_H
    +
    +#include <linux/fs.h>
    +#include <linux/tracepoint.h>
    +
    +TRACE_EVENT(find_get_page,
    +
    + TP_PROTO(struct address_space *mapping, pgoff_t offset,
    + struct page * page),
    +
    + TP_ARGS(mapping, offset, page),
    +
    + TP_STRUCT__entry(
    + __field(dev_t, s_dev)
    + __field(ino_t, i_ino)
    + __field(pgoff_t, offset)
    + __field(struct page *, page)
    + ),
    +
    + TP_fast_assign(
    + __entry->s_dev = mapping->host ? mapping->host->i_sb->s_dev : 0;
    + __entry->i_ino = mapping->host ? mapping->host->i_ino : 0;
    + __entry->offset = offset;
    + __entry->page = page;
    + ),
    +
    + TP_printk("s_dev=%u:%u i_ino=%lu offset=%lu %s", MAJOR(__entry->s_dev),
    + MINOR(__entry->s_dev), __entry->i_ino, __entry->offset,
    + __entry->page == NULL ? "page_not_found" : "page_found")
    +);
    +
    +TRACE_EVENT(add_to_page_cache,
    +
    + TP_PROTO(struct address_space *mapping, pgoff_t offset),
    +
    + TP_ARGS(mapping, offset),
    +
    + TP_STRUCT__entry(
    + __field(dev_t, s_dev)
    + __field(ino_t, i_ino)
    + __field(pgoff_t, offset)
    + ),
    +
    + TP_fast_assign(
    + __entry->s_dev = mapping->host->i_sb->s_dev;
    + __entry->i_ino = mapping->host->i_ino;
    + __entry->offset = offset;
    + ),
    +
    + TP_printk("s_dev=%u:%u i_ino=%lu offset=%lu", MAJOR(__entry->s_dev),
    + MINOR(__entry->s_dev), __entry->i_ino, __entry->offset)
    +);
    +
    +TRACE_EVENT(remove_from_page_cache,
    +
    + TP_PROTO(struct address_space *mapping, pgoff_t offset),
    +
    + TP_ARGS(mapping, offset),
    +
    + TP_STRUCT__entry(
    + __field(dev_t, s_dev)
    + __field(ino_t, i_ino)
    + __field(pgoff_t, offset)
    + ),
    +
    + TP_fast_assign(
    + __entry->s_dev = mapping->host->i_sb->s_dev;
    + __entry->i_ino = mapping->host->i_ino;
    + __entry->offset = offset;
    + ),
    +
    + TP_printk("s_dev=%u:%u i_ino=%lu offset=%lu", MAJOR(__entry->s_dev),
    + MINOR(__entry->s_dev), __entry->i_ino, __entry->offset)
    +);
    +
    +#endif /* _TRACE_FILEMAP_H */
    +
    +/* This part must be outside protection */
    +#include <trace/define_trace.h>
    Index: linux-2.6-tip/mm/filemap.c
    ===================================================================
    --- linux-2.6-tip.orig/mm/filemap.c
    +++ linux-2.6-tip/mm/filemap.c
    @@ -34,6 +34,8 @@
    #include <linux/hardirq.h> /* for BUG_ON(!in_atomic()) only */
    #include <linux/memcontrol.h>
    #include <linux/mm_inline.h> /* for page_is_file_cache() */
    +#define CREATE_TRACE_POINTS
    +#include <trace/events/filemap.h>
    #include "internal.h"

    /*
    @@ -149,6 +151,7 @@ void remove_from_page_cache(struct page
    spin_lock_irq(&mapping->tree_lock);
    __remove_from_page_cache(page);
    spin_unlock_irq(&mapping->tree_lock);
    + trace_remove_from_page_cache(mapping, page->index);
    mem_cgroup_uncharge_cache_page(page);
    }

    @@ -440,6 +443,7 @@ int add_to_page_cache_locked(struct page
    if (PageSwapBacked(page))
    __inc_zone_page_state(page, NR_SHMEM);
    spin_unlock_irq(&mapping->tree_lock);
    + trace_add_to_page_cache(mapping, offset);
    } else {
    page->mapping = NULL;
    spin_unlock_irq(&mapping->tree_lock);
    @@ -663,6 +667,7 @@ repeat:
    }
    rcu_read_unlock();

    + trace_find_get_page(mapping, offset, page);
    return page;
    }
    EXPORT_SYMBOL(find_get_page);
    Index: linux-2.6-tip/mm/truncate.c
    ===================================================================
    --- linux-2.6-tip.orig/mm/truncate.c
    +++ linux-2.6-tip/mm/truncate.c
    @@ -20,6 +20,7 @@
    do_invalidatepage */
    #include "internal.h"

    +#include <trace/events/filemap.h>

    /**
    * do_invalidatepage - invalidate part or all of a page
    @@ -384,6 +385,7 @@ invalidate_complete_page2(struct address
    BUG_ON(page_has_private(page));
    __remove_from_page_cache(page);
    spin_unlock_irq(&mapping->tree_lock);
    + trace_remove_from_page_cache(mapping, page->index);
    mem_cgroup_uncharge_cache_page(page);
    page_cache_release(page); /* pagecache ref */
    return 1;
    Index: linux-2.6-tip/mm/vmscan.c
    ===================================================================
    --- linux-2.6-tip.orig/mm/vmscan.c
    +++ linux-2.6-tip/mm/vmscan.c
    @@ -48,6 +48,8 @@

    #include "internal.h"

    +#include <trace/events/filemap.h>
    +
    struct scan_control {
    /* Incremented by the number of inactive pages that were scanned */
    unsigned long nr_scanned;
    @@ -478,6 +480,7 @@ static int __remove_mapping(struct addre
    } else {
    __remove_from_page_cache(page);
    spin_unlock_irq(&mapping->tree_lock);
    + trace_remove_from_page_cache(mapping, page->index);
    mem_cgroup_uncharge_cache_page(page);
    }





    \
     
     \ /
      Last update: 2009-12-12 02:03    [W:0.047 / U:87.688 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site