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Small optimization

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git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@559 d57e44dd-8a1f-0410-8b47-8ef2f437770f
This commit is contained in:
Vladislav Bolkhovitin
2008-10-31 18:56:01 +00:00
parent 06905f3e57
commit b748ebde74
1 changed files with 13 additions and 2 deletions
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scst/src/dev_handlers/scst_user.c
+13 -2
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@@ -806,14 +806,24 @@ static void dev_user_flush_dcache(struct scst_user_cmd *ucmd)
{
struct scst_user_cmd *buf_ucmd = ucmd->buf_ucmd;
unsigned long start = buf_ucmd->ubuff;
int i;
int i, bufflen = ucmd->cmd->bufflen;
TRACE_ENTRY();
if (start == 0)
goto out;
for (i = 0; i < buf_ucmd->num_data_pages; i++) {
/*
* Possibly, flushing of all the pages from ucmd->cmd->sg can be
* faster, since it should be cache hot, while ucmd->buf_ucmd and
* buf_ucmd->data_pages are cache cold. But, from other side,
* sizeof(buf_ucmd->data_pages[0]) is considerably smaller, than
* sizeof(ucmd->cmd->sg[0]), so on big buffers going over
* data_pages array can lead to less cache misses. So, real numbers are
* needed. ToDo.
*/
for (i = 0; (bufflen > 0) && (i < buf_ucmd->num_data_pages); i++) {
struct page *page;
page = buf_ucmd->data_pages[i];
#ifdef ARCH_HAS_FLUSH_ANON_PAGE
@@ -823,6 +833,7 @@ static void dev_user_flush_dcache(struct scst_user_cmd *ucmd)
#endif
flush_dcache_page(page);
start += PAGE_SIZE;
bufflen -= PAGE_SIZE;
}
out: