[PATCH 8/8] perf ui/tui: Remember last log line for filtering

[Namhyung Kim]

From: Namhyung Kim <namhyung....@lge.com>

When updating log window with filter string, no need to search all
logs everytime.  Just save the last offset and update from there.

Signed-off-by: Namhyung Kim <namhy...@kernel.org>
---
 tools/perf/ui/browsers/log.c | 26 ++++++++++++++++++++------
 1 file changed, 20 insertions(+), 6 deletions(-)

diff --git a/tools/perf/ui/browsers/log.c b/tools/perf/ui/browsers/log.c
index 62343e0578bb..6491c353eef7 100644
--- a/tools/perf/ui/browsers/log.c
+++ b/tools/perf/ui/browsers/log.c
@@ -13,10 +13,11 @@
 struct log_browser_data {
        unsigned long offset;
        u32 alloc;
+       u32 last_log_line;
        char filter[64];
 };
 
-static void __log_menu__filter(struct ui_browser *menu, char *filter);
+static void __log_menu__filter(struct ui_browser *menu, char *filter, bool 
update);
 
 static void ui_browser__file_seek(struct ui_browser *browser __maybe_unused,
                                  off_t offset __maybe_unused,
@@ -61,7 +62,7 @@ static unsigned int ui_browser__file_refresh(struct 
ui_browser *browser)
 
        if (perf_log.linemap_changed) {
                /* update log window with new linemap */
-               __log_menu__filter(browser, lbd->filter);
+               __log_menu__filter(browser, lbd->filter, true);
                perf_log.linemap_changed = false;
        }
 
@@ -78,14 +79,15 @@ static unsigned int ui_browser__file_refresh(struct 
ui_browser *browser)
        return row;
 }
 
-static void __log_menu__filter(struct ui_browser *menu, char *filter)
+static void __log_menu__filter(struct ui_browser *menu, char *filter, bool 
update)
 {
        char buf[1024];
        struct log_browser_data *lbd = menu->priv;
        off_t *linemap = NULL;
        u32 lines = 0;
        u32 alloc = 0;
-       u32 i;
+       u32 last = 0;
+       u32 i = 0;
 
        if (*filter == '\0') {
                linemap = perf_log.linemap;
@@ -93,7 +95,14 @@ static void __log_menu__filter(struct ui_browser *menu, char 
*filter)
                goto out;
        }
 
-       for (i = 0; i < perf_log.lines; i++) {
+       if (update) {
+               linemap = menu->entries;
+               lines = menu->nr_entries;
+               alloc = lbd->alloc;
+               last = lbd->last_log_line;
+       }
+
+       for (i = last; i < perf_log.lines; i++) {
                fseek(perf_log.fp, perf_log.linemap[i], SEEK_SET);
                if (fgets(buf, sizeof(buf), perf_log.fp) == NULL)
                        goto error;
@@ -120,7 +129,12 @@ out:
                BUG_ON(menu->entries == perf_log.linemap);
                free(menu->entries);
        }
+
        lbd->alloc = alloc;
+       lbd->last_log_line = i;
+
+       if (!update)
+               ui_browser__reset_index(menu);
 
        menu->entries = linemap;
        ui_browser__update_nr_entries(menu, lines);
@@ -136,7 +150,7 @@ static void log_menu__filter(struct ui_browser *menu, char 
*filter)
 
        pthread_mutex_lock(&ui__lock);
        fgetpos(perf_log.fp, &pos);
-       __log_menu__filter(menu, filter);
+       __log_menu__filter(menu, filter, false);
        fsetpos(perf_log.fp, &pos);
        perf_log.linemap_changed = false;
        pthread_mutex_unlock(&ui__lock);
-- 
1.7.11.7

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